¡ IMS 8.2¡¿MRP6600 V100R003C02 I-BGF Feature Description

 

MRP6600 V100R003C02 IBGF Feature Description By Zhang Chi

www.huawei.com

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

 

References 

TS 29.162 (V9.4.0) (2010–03), Interworking between the IM CN subsystem and IP networks



TS 23.218 (V9.2.0) (2010–06), IP Multimedia (IM) session handling; IM call model; Stage 2



TS 23.228 (850) (2008–06), IP Multimedia Subsystem (IMS)



TS 182 006 (1.1.1)-(2006–03), IP Multimedia Subsystem (IMS)

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page 2

 

Objectives By the end of this course, you will be able to: 

Describe the I-BGF networking.



Know I-BGF functions. 

Be familiar with routine operation and maintenance of the I-BGF.

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Contents 1.

I-BGF Services

2.

I-BGF Service Provisioning

3.

4.

I-BGF Service Flow I-BGF Service Configuration

5.

I-BGF Commissioning

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Concepts Abbreviations

Full Spelling

CSCF

Call Session Control Function

I-CSCF

Interrogating-CSCF

I-BCF

Interconnection Border Control Function

I-BGF

Interconnection Border Gateway Function

I MS NAPT

IP Multimedia Subsystem Network Address and Port Translation

P-CSCF

Proxy-CSCF

QoS

Quality of Service

RACS

Resource and Admission Control Subsystem

S-CSCF SBC

Serving-CSCF Session Border Controller 

SIP

Session Initiation Protocol

TC

Transcoder

TrGW

Transition Gateway

UE

User Equipment

VTC

Video Transcoder  

 

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Networking    

ignalling

HSS HS S 

DNS DN S 

 

Bearer 

S-CSCF 

I-CSCF  Mx 

P-CSCF 

BGCF  Mx 

Mx 

I-BCF IBCF Mx

 

IMS-ALG

IMS network 

Gq Gq’’ 

IP-CAN   

UE

THIG

RACS  Border Control Functions

Ia 

Other IMS/SIP network

I-BGF 

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Background and Causes 

Background: The wide use of IMS networks enables fixed and mobile convergence, which implements independent access of GSM/UMTS, CDMA, WLAN, and fixed broadband terminals.

 

The I-BCF and I-BGF are used for interconnecting an IMS network to another IMS network or a SIP network.



Causes: The I-BCF and I-BGF implement the following functions:

1.

Rou Route te ana analys lysis, is, in invol volvin ving g number number an analy alysis sis,, topo topolog logy y hidi hiding, ng, an and d sign signalin aling g filt filteri ering ng

2.

Charging

3.

Bearer Bea rer cont control rol,, involv involving ing NAPT NAPT,, renego renegotia tiatio tion, n, trans transcod coding ing,, QoS cont control rol,, and address latching

4.

Se Secu curi rity ty,, invo involv lvin ing g fl flow ow co cont ntro roll 

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I-BGF Service Principles Category

Function

NAPT between domains

NAPT mapping Bearer control and NAPT media mapping

 Audio/video transcoding

Transcoding for calls within an IMS network or between an IMS network and anothe anotherr network

QoS control

QoS control of the DSCP of a media stream based on the QoS indication of th the II-BCF

Security

Flow control of the "b" line of a media stream based on the "b" line indication of the I-BCF

Media control for interworking

Session media control during session renegotiation

sessions

Gate control for media streams  Address latching of media streams Media control for interruption detection of media streams Media control for bearer auditing

Limitations

Transcoding is applicable to only audio and video services. In addition to the audio and video services, only the fax service is supported; fax data can be transparently transmitted, not detected. Conversion of IPv4 IP addresses to IPv6 IP addresses is not supported. The TCP protocol is not supported. Only DTMF and RFC 2833 numbers can be transparently transmitted.

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I-BGF Service Principles I-BCF IBCF

SIP (SDP)

I-BGF (MRFP) IBGF(MRFP)

SIP (SDP)

Ix(H248)

AUDIO

Remote

IMS-A

Inner domain inner.com

TC Local

 

T1 VTC

Local

 

T2

Outer domain outer.com

Remote

IMS-B

VEDIO

For the I-BCF service principles, see the I-BCF documents. Working principle:  Inter-domain

NAPT: NAPT between the inner domain and the outer domain, as shown in the above

figure  Transcoding:

as shown in terminations T1 and T2 in the above figure

•

If the codecs used in audio or video streams are different, the I-BGF uses the TC or VTC to convert the codecs for the media streams.

•

If the codecs used in audio or video streams are the same, the I-BGF transparently transmits the media streams without converting codecs.

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Requirements for Implementing IBGF Services 



Requirements for MEs 

MRP6600 V100R003C02 provides the I-BGF functions.



CSC3300 V100R008C02 provides the I-BCF functions.

Requirements for the license 



 Audio interworking is controlled by the license of Number of Audio Interworking Channels. Video interworking is controlled by the license of Number of Video Interworking Channels.



 Audio transcoding is controlled by the licenses of Number of Audio Transcoding Channels and Number of Audio Interworking Channels.



Video format transforming is controlled by the licenses of Number of Video Format Transforming Channels and Number of Video Interworking Channels.



Limitations (service conflict or terminal requirements) 

The I-BGF applies only to IMS networks.

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Contents 1.

I-BGF Services

2.

I-BGF Service Provisioning

3. 4.

I-BGF Service Flow I-BGF Service Configuration

5.

I-BGF Commissioning

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I-BGF Service Provisioning Service provisioning is inapplicable to the I-BGF.

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Contents 1.

I-BGF Services

2.

I-BGF Service Provisioning

3. 4.

I-BGF Service Flow I-BGF Service Configuration

5.

I-BGF Commissioning

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

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Service Flow of NAPT Mapping I-BCF

I-BGF (MRFP)

When a termination is added, the I-BGF enables the interworking services based on the media stream carried in the message: • If the message carries an audio stream, the I-BGF enables the audio interworking service. • If the message carries an audio/video stream, the I-BGF enables service. the video interworking

After the session is set up, the I-BGF performs NAPT for the media streams between the terminations. • If the codecs of two terminations are different, a TC or VTC is required for transcoding. • If the codecs of two terminations are the same, a TC or VTC is not required.

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Service Flow for Session Renegotiation Definition of renegotiation:  A procedure that two terminations renegotiate media connection after the session between the terminations is set up.

I-BCF

 Application scenarios: •  A video stream is to be added to an audio stream so that the stream becomes an audio/video stream. The video stream is to be deleted from an audio/video stream so that the stream becomes an audio stream. • The parameters, such as remote IP address, port, and codec, are to be modified for an audio stream or a video stream. •  An audio stream is to be switched •

to a fax, and the fax is to be transparently transmitted in G.711 or T38 format.

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

I-BGF (MRFP)

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Service Flow for Media Stream Interruption Detection Definition of interruption detection (interruption checking):  A function that enables en ables the I-BGF (MRP6600) tto o report a message for an media stream exception to the I-BCF if the IBGF detects a partial or entire interruption in the media streams for a call based on the interruption detection mechanism. On receiving the message, the I-BCF determines whether to release the call and delete all the media streams or to only delete the abnormal media stream based on the current status of the session.

The I-BGF supports one-way interruption detection and two-way interruption detection.

The I-BCF sends an nt/netfail event to instruct the I-BGF to enable the interruption detection function.

stream exception to the I-BCF if the IBGF detects an interruption in the received or sent media streams for a call.

One-way interruption detection: The IBGF reports a message for an media

Two-way interruption detection: The IBGF reports a message for an media stream exception to the I-BCF if the IBGF detects an interruption in the

I-BCF

received and sent media streams for a call.

I-BGF(MRFP) IP

TC

IP

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Service Flow for QoS Control Definition of Quality of Service (QoS) control:  A function that enables en ables the I-BGF (MRP6600) to set the DiffServ/DSCP attribute to the header field of the IP address in each packet to ensure the QoS of service streams of higher priority.

0 4-bit version

4-bit header length

15 8-bit type of service (TOS)

The DiffServ/DSCP attribute uses the TOS field in the header field. Only the higher six bits of the TOS field are used for the DiffServ/DSCP attribute, and other bits are neglected.

31 16-bit total length (in bytes)

3-bit flags

16-bit identification 8-bit time to live (TTL)

16

8-bit protocol

13-bit fragment offset

16-bit header checksum

20 bytes

32-bit source IP address 32-bit destination IP address 32-bit options (if any)

The router handles the packet received from the I-BGF

data

according to the DSCP attribute. The I-BCF sends a ds/dscp packet to instruct the I-BGF to enable the QoS control function.

I-BCF

I-BGF (MRFP) IP

TC

IP payload RTP UDP

The I-BGF adds the DSCP attribute received from the I-BCF to the IP packets of the media streams to be forwarded.

IP(DSCP) MAC

Only four bits, bit 3 to bit 6, of the TOS field are valid. Bits 3 to 6 respectively represents the minimum delay, maximum throughput, highest reliability, and minimum cost. Only one of the four bits can be set to 1. If the four bits are set to 0, the service is of normal priority.

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Service Flow for CAR I-BGF

Definition of committed access rate (CAR):  A function that enables en ables the I-BGF (MRP6600) to check the bandwidth for media streams. If a media stream exceeds the limitation of the bandwidth, the I-BGF discards the extra packets to avoid bandwidth theft and ensure the network security and service reliability. The I-BGF limits the media streams within the bandwidth specified in B=AS: bandwidth bandwidth,, in a SDP message.

The I-BGF checks the bandwidth used by a UE. If the bandwidth used by a UE exceeds the limitation, the I-BGF discards the extra packets.

The I-BGF calculates the bandwidth limitation for received media streams according to the "b" line received from the I-BCF.

I-BCF

For media streams that exceed the bandwidth limitation, the I-BGF discards the extra packets. Only RTP packets are discarded, while RTCP packets are not.

I-BGF (MRFP) IP

TC

IP

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Service Flow for Media Latching I-BCF

Definition of address latching:  A function that enables en ables the I-BGF (MRP6600) to obtain the source IP address of a media stream that is received from a UE on an IMS network through a hosted NAT device by latching the initial RTP message sent from the UE. When the I-BGF a interworks withdevice, an IMSthe Inetwork through hosted NAT BGF cannot directly obtain the IP address assigned by the hosted NAT device to a media stream. The hosted NAT device assigns an IP address in address domain 2 to the media stream after the UE sends a packet. The I-BGF latches this initial packet to obtain the source IP address of the media stream from the hosted NAT device. The I-BCF sends the signal descriptor "napt=LATCH/RELATCH" to instruct the IBGF to enable the latching function.

SIP signaling (SDP)

Hosted NAT device Media streams

I-BGF (MRFP)

IMS A  Address domain 1

SIP signaling (SDP)

 Address domain 2

Media streams

I MS B

 Address domain 3

The I-BGF latches the initial packet to obtain the source IP address of the media stream from the hosted NAT device.

I-BCF

Incoming SA=CPE1 DA=MGA

 

I-BGF (MRFP) IP

TC

IP Outgoing SA=MGA DA=CPE1

 

Remote Descriptor 

RA=CPE2

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Contents 1.

I-BGF Services

2.

I-BGF Service Provisioning

3. 4.

I-BGF Service Flow I-BGF Service Configura Configuration tion

5.

I-BGF Commissioning

Page 19

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I-BGF Service Configuration Relationships of the command list and commands

Start

Change the value of the domain attribute of the IBCF.

Convert H.248 messages of the IBCF into the binary format.

MOD IPIF

Changes the value of DOMAIN  on BACK2 and DOMAIN on BACK3 to the same as that on the I-BCF.

MOD IPIF

Change the value of the interface attribute.

Changes the attribute of BACK4. Configure an IP address.

 ADD IPADDR

Configures the media and a nd signaling IP addresses.

 ADD GWADDR

Configures the gateway IP I P addresses that map

Configure a gateway address.

the media and signaling IP addresses.  ADD IFPG

Configures the interface interfa ce protection group.

 ADD VMRFP

Configures a virtual MRFP.

 ADD MRFC

Configures a virtual MRFC.

Configure an interface protection group.

Configure a virtual MRFP.

Configure an MRFC.

 ADD H248LNK

Configures an H.248 link.

 ACT VMRFP

Activates a virtual MRFP.

For details, see Configuration Example.

Configure H.248 links.

 Activate the virtual MRFP.

End

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I-BGF Service Configuration Commands used for configuring interworking between the MRFP and the I-BCF: Setting, modifying, and querying an VMRFP network type



Setting, modifying, and querying the domain ID of an interface



Name

Command

Description

Name

Command

Description

 Add Virtual MRFP

 ADD VMRFP

 An enumerated value is added for the parameter Net  Type Net Type:: I-BGF. The parameter is mandatory in this version.

Modify IP Interface

MOD IPIF

Modify Virtual MRFP

MOD VMRFP

 An enumerated value is added for the parameter Net  Type Net Type:: I-BGF.

The value of DOMAIN on DOMAIN  on the IBGF must be the same as the value of DOMAIN on DOMAIN  on the I-

List Virtual MRFP

LST VMRFP

 An enumerated value is added for the parameter Net  Type Net Type:: I-BGF.

BCF. List IP Interface

LST IPIF

The value of DOMAIN configured DOMAIN  configured for the interface is displayed.

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I-BGF Service Configuration Example  /*Change the attributes of the H.248 signaling interface (BACK4) (BACK4) and bearer interfaces (BACK2 and BACK3).*/ MOD IPIF: RN=0, PN=0, SN=11, IFN=BACK2, DOMAIN=1 , BEARBW=1024000;

MOD IPIF: RN=0, PN=0, MOD IPIF: RN=0, PN=0, MOD IPIF: RN=0, PN=0, MOD IPIF: RN=0, PN=0, MOD IPIF: RN=0, PN=0,

SN=13, IFN=BACK2, DOMAIN=1 , BEARBW=1024000; SN=11, IFN=BACK3, DOMAIN=2 , BEARBW=1024000; SN=13, IFN=BACK3, DOMAIN=2 , BEARBW=1024000; SN=11, IFN=BACK4, BEARBW=0; SN=13, IFN=BACK4, BEARBW=0;

 /*Configure the media and signaling IP addresses on BACK2, BACK3, and BACK4 respectively.*/  ADD IPADDR:IPADDRID=2,RN IPADDR:IPADDRID=2,RN=0,PN=0,SN=11,IFN= =0,PN=0,SN=11,IFN=BACK2,IPADDRESS= BACK2,IPADDRESS="10.10.1.67",MASK="255.255.255.128",FLAG= "10.10.1.67",MASK="255.255.255.128",FLAG=MASTER,ISVLAN=N MASTER,ISVLAN=NO,IFMPLS=NO,ISFS O,IFMPLS=NO,ISFS=NO; =NO;  ADD IPADDR:IPADDRID=3,RN IPADDR:IPADDRID=3,RN=0,PN=0,SN=11,IFN= =0,PN=0,SN=11,IFN=BACK3,IPADDRESS= BACK3,IPADDRESS="10.10.1.68",MASK="255.255.255.128",FLAG= "10.10.1.68",MASK="255.255.255.128",FLAG=MASTER,ISVLAN=N MASTER,ISVLAN=NO,IFMPLS=NO,ISFS O,IFMPLS=NO,ISFS=NO; =NO;  ADD IPADDR:IPADDRID=4,RN IPADDR:IPADDRID=4,RN=0,PN=0,SN=11,IFN= =0,PN=0,SN=11,IFN=BACK4,IPADDRESS= BACK4,IPADDRESS="200.1.1.12",MASK="255.255.255.128",FLAG= "200.1.1.12",MASK="255.255.255.128",FLAG=MASTER,ISVLAN=N MASTER,ISVLAN=NO,IFMPLS=NO,ISFS O,IFMPLS=NO,ISFS=NO; =NO; and d signaling IP addresses.*/  /*Configure the gateway addresses that map the media an  ADD GWADDR:GWADDRID GWADDR:GWADDRID=2,IPADDRESS="1 =2,IPADDRESS="10.10.1.67",GWADDRES 0.10.1.67",GWADDRESS="10.10.1.1",TIMEOUT=N S="10.10.1.1",TIMEOUT=NOAGING; OAGING;  ADD GWADDR:GWADDRID GWADDR:GWADDRID=3,IPADDRESS="1 =3,IPADDRESS="10.10.1.68",GWADDRES 0.10.1.68",GWADDRESS="10.10.1.1",TIMEOUT=N S="10.10.1.1",TIMEOUT=NOAGING; OAGING;  ADD GWADDR:GWADDRID GWADDR:GWADDRID=4,IPADDRESS="2 =4,IPADDRESS="200.1.1.12",GWADDRES 00.1.1.12",GWADDRESS="200.1.1.1",TIMEOUT=N S="200.1.1.1",TIMEOUT=NOAGING; OAGING;  /*Configure the interface protection group.*/  ADD IFPG:PGIDX=2,RN=0,PN=0,SN IFPG:PGIDX=2,RN=0,PN=0,SN=11,IFN=BACK2; =11,IFN=BACK2;  ADD IFPG:PGIDX=3,RN=0,PN=0,SN IFPG:PGIDX=3,RN=0,PN=0,SN=11,IFN=BACK3; =11,IFN=BACK3;  ADD IFPG:PGIDX=4,RN=0,PN=0,SN IFPG:PGIDX=4,RN=0,PN=0,SN=11,IFN=BACK4; =11,IFN=BACK4;  /*Configure the VMRFP.*/  ADD VMRFP: VMRFPID=0, VMRFPID=0, MIDTYPE=IP, M MID="200.1.1.12:2945", ID="200.1.1.12:2945", NETTYPE=I-BGF ;  /*Configure the MRFC.*/

 ADD MRFC: VMRFPID=0, VMRFPID=0, MRFCID MRFCIDX=0, X=0, MIDTYPE=IP, MID="200.1.1.11:2945", MID="200.1.1.11:2945", MSS=MASTER MSS=MASTER;;  /*Configure the H.248 link.*/  ADD H248LNK: LINKID=0, LINKID=0, VMRFPID=0, MR MRFCIDX=0, FCIDX=0, TT=SCTP, LO LOCALIP="200.1.1.12", CALIP="200.1.1.12", LOCALPORT=2946, LOCALPORT=2946, PEERIP="200.1.1.1 PEERIP="200.1.1.11", 1", PEERPORT=2945, PPUMID=301; PPUMID=301;  ADD H248LNK: LINKID=1, LINKID=1, VMRFPID=0, MR MRFCIDX=0, FCIDX=0, TT=SCTP, LO LOCALIP="200.1.1.12", CALIP="200.1.1.12", LOCALPORT=2948, LOCALPORT=2948, PEERIP="200.1.1.1 PEERIP="200.1.1.11", 1", PEERPORT=2945, PPUMID=302; PPUMID=302;  ADD H248LNK: LINKID=2, LINKID=2, VMRFPID=0, MR MRFCIDX=0, FCIDX=0, TT=SCTP, LO LOCALIP="200.1.1.12", CALIP="200.1.1.12", LOCALPORT=2945, LOCALPORT=2945, PEERIP="200.1.1.1 PEERIP="200.1.1.11", 1", PEERPORT=2945, PPUMID=303; PPUMID=303;  ADD H248LNK: LINKID=3, LINKID=3, VMRFPID=0, MR MRFCIDX=0, FCIDX=0, TT=SCTP, LO LOCALIP="200.1.1.12", CALIP="200.1.1.12", LOCALPORT=2947, LOCALPORT=2947, PEERIP="200.1.1.1 PEERIP="200.1.1.11", 1", PEERPORT=2945, PPUMID=304; PPUMID=304;  /*Activate the VMRFP.*/  ACT VMRFP: VMRFPID=0; VMRFPID=0;

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

 

Contents 1.

I-BGF Services

2.

I-BGF Service Provisioning

3. 4.

I-BGF Service Flow I-BGF Service Configuration

5.

I-BGF Commissioning

Page 23

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page 24

 

Service Verification Step

Operation

Description

1

Per Perform orm tth he d diiall-u up tte est.

Use a UE to to p pe erfor form d diial-up test to to c ch heck w wh hether ther the a aud udiio iin nter terworki rking iis s successful. If the audio interworking fails, proceed to verify the I-BGF services.

2

Check configurations.

Run LST VMRFP or ACT VMRFP to check or activate the VMRFP. Run DSP H248LNK, H248LNK, LST H248LNK, H248LNK, or ADD H248LNK to check or modify an H.248 link. Run LST MRFC or ADD MRFC to check or add the MRFC. Run LST VMRFP or ADD VMRFP to check or add the VMRFP. Run LST GWADDR or ADD GWADDR to check or add the gateway. Run LST IPADDR or ADD IPADDR to check or add an IP Address.

3

Check DOMAIN DOMAIN of  of the

Run LST IPIF or MOD IPIF to check or modify the domain attribute of the

bearer IP address.

MRFP. The domain attribute must be the same as that on the I-BCF.

4

Check Net Type. Type.

Run LST VMRFP or MOD VMRFP to check or modify Net Type to I-BGF I-BGF..

5

Perform the dial-up test

Use a UE to perform dial-up test again to check whether the audio

again.

interworking is successful. If the audio interworking still fails, contact Huawei technical support engineers for troubleshooting.

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Service Fault Analysis Gateway

Gateway parse

Run DSP ROUTE to check whether the gateway parse is successful.

failure

fails.

Create an ARP trace task to check c heck whether ARP requests and

Start

responses on the MRFP are normal.

Rectify gateway faults.

Check Yes whether the interworking fault is rectified.

The registration

Run DSP H248LNK, H248LNK, LST H248LNK, H248LNK, and ADD H248LNK to check

of the gateway

and add an H.248 link.

is abnormal.

Run DSP VMRFP and ACT VMRFP to check and activate the VMRFP.

No Correct inconsist inconsistent ent parameter settings.

Run PING PING to  to check whether the network is pingable. Create an SCTP trace task to check whether the SCTP link for the MRFP is normal.

Check Yes whether the interworking fault is rectified.

Inconsistency

The domain

Check whether the domain attribute of on the I-BCF complies with

with I-BCF

attribute of the

the planning.

interworking

I-BCF is

Change the domain attribute of the I-BCF.

parameters

incorrect.

Change the H.248 message format of the I-BCF to binary.

The domain

Run LST IPIF and MOD IPIF to check and change the domain

attribute of the

attribute on the MRFP to be the same as the domain attribute on the

I-BGF is

I-BCF.

No Rectify network faults.

Check Yes whether the interworking fault is rectified.

incorrect.

No Contact Huawei technical support engineers.

End

Net Type

The value of

Failure

Net Type Net  Type is  is not I-BGF.. I-BGF

Run LST VMRFP and MOD VMRFP to check and modify Net Type  Type  to I-BGF I-BGF..

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Question

Page 26

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