SIP trunk early offer

[j.huizinga]

Hi,

We have configured a trunk with a provider using CUBE.

Callmanager--------CUBE--------Provider

The provider wants early offer and G729r8

So we configured a SIP trunk with a device pool/region so that only g729 is allowed between SIP trunk and the rest.

We have configured an IOS MTP resource, and this is registered on callmanager:

!

dspfarm profile 2 mtp

codec g729r8

maximum sessions software 20

associate application SCCP

!

!

The mtp resource is assign to the trunk using MR-list and MR-group

The trunk has MTP enabled with "MTP prefered Codec" G729b/G729ab

On CUBE we enable "deb ccsip mess" and we see the invite comming from callmanager, but without attached SDP

What must be done to make callmanager use early-offer?

Thanks for the help,

Jan

[Joseph Martini]

Check MTP required on the SIP trunk configuration page or if you are on CUCM 8.5 or later go to the SIP Profile (Device > Device Settings > SIP Profile) and check "Early Offer support for voice and video calls (insert MTP if needed)".

[j.huizinga]

Hello Joe,

I have MTP required enabled on the trunk, but it doesn't really change anything.

If I enable, or don't enable "MTP required" the SIP INVITE from callmanager is the same.

We are running Callmanager 7.1.5, so we don't have the option in the SIP profile.

When we establish a call I can see that the IOS MTP is involved (show sccp connections) but no early offer.

To make a successfull cal we force the provider dial-peer to use G729 only.

Unfortunately this IOS doesn't have the forced early offer option.

Is there someone who has succeeded in making CM 7.1.5 do an early offer?

Thanks,

Jan

[nikshah]

Hi Jan,

Here is your answer

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/media.html#wp1055833

Snippet from above

SIP Early Offer

SIP negotiates media exchange via Session Description Protocol (SDP),  where one side offers a set of capabilities to which the other side  answers, thus converging on a set of media characteristics. SIP allows  the initial offer to be sent either by the caller in the initial INVITE  message or, if the caller chooses not to, the called party can send the  initial offer in the first reliable response. By default, Unified CM  sends the INVITE without an initial offer, and it requires MTP resources  to send the offer in the INVITE. Note that this initial offer is  limited to the G.711 codec only.

Also note that MTP resources are not required for incoming INVITE messages, whether or not they contain an initial offer.

Regards

Niket

[j.huizinga]

Hi Niket,

You seem to be right, when I force 711 I see early offer.

But it is weird that on the trunk configuration page, it allows me to select a g729 codec as prefered codec.

Can you explain why this option is there, although it doesn't sem to work?

Thanks for your help,

Jan

[nikshah]

Hi Jan,

I dont know whats the logic and i dont have a confirmed answer, behind not supporting the g729 codec in CM 7.1.5 , however when i open the SRND for CM 8.x

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/trunks.html#wp1126420

I dont see any requirements on the codec.

So somewhere between CM 7.x and CM 8.x there must be a fix for supporting the g729 codec on early offer.

Hope this helps.

Regards

Niket

[j.huizinga]

Hi Niket,

Thank you very much.

We are testing now with another router that has an IOS which supports 'SIP early offer forced' and we hope that this will work.

So the callmanager will send a normal INVITE (delayed offer) and the CUBE will send out a early offer to the provider.

Regards,

Jan

[Ayodeji Okanlawon]

J,

Did the early offer-forced work?

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"For the love of God is broader than the measure of man's mind And the heart of the Eternal is most wonderfully kind"

[j.huizinga]

Hi,

We haven't configured yet. I shall let the community know.

Thanks for all,

Jan

[Ayodeji Okanlawon]

J,

I just saw your query on the ask the expert forum. I thought I should chip in here for you.

Yes CUCM can send delay offer and CUBE can send early offer. This is how we have it configured for one of my biggest customers with 3 clusters (8 server/cluster) and it works very well...

Here is a snippet from our CUBE config..

sip

early-offer forced.

Here is a sample trace..

+++++CUCM sends invite without early offer+++++++++

Received:
INVITE sip:07544455678@172.16.10.74:5060 SIP/2.0
Via: SIP/2.0/UDP 172.16.10.174:5060;branch=z9hG4bKa41e64e002602
From: "Chelmsford" <01256748210>;tag=517285~ffa80926-5fac-4dd6-b405-2dbbc56ae9a2-400694295
To: <07544455678>
Date: Mon, 18 Jun 2012 09:46:00 GMT
Call-ID: 67d44180-fde1f8d8-3aead-ae28690a@172.16.10.174
Supported: timer,resource-priority,replaces
Min-SE:  1800
User-Agent: Cisco-CUCM8.6
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Call-Info: <172.16.10.174:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 1741963648-0000065536-0000064326-2921883914
Session-Expires:  84600
Contact: <01256748210>
Max-Forwards: 70
Content-Length: 0

++++++++++++++CUBE sends a trying to CUCM++++++++++++++++

Sent:
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 172.16.10.174:5060;branch=z9hG4bKa41e64e002602
From: "Chelmsford" <01256748210>;tag=517285~ffa80926-5fac-4dd6-b405-2dbbc56ae9a2-400694295
To: <07544455678>
Date: Mon, 18 Jun 2012 09:46:00 GMT
Call-ID: 67d44180-fde1f8d8-3aead-ae28690a@172.16.10.174
CSeq: 101 INVITE
Allow-Events: kpml, telephone-event
Server: Cisco-SIPGateway/IOS-12.x
Content-Length: 0

+++++++++CUBE sends an invite to ITSP with Early Offer++++++++++

010625: Jun 18 09:46:00.371: //452987/67D441800000/SIP/Msg/ccsipDisplayMsg:
Sent:
INVITE sip:07544455678@10.100.33.54:5070 SIP/2.0
Via: SIP/2.0/UDP 172.16.10.74:5060;branch=z9hG4bKFE71F2421
Remote-Party-ID: "Chelmsford" <441256748210>;party=calling;screen=no;privacy=off
From: "Chelmsford" <441256748210>;tag=88EFEFBA-14A2
To: <07544455678>
Date: Mon, 18 Jun 2012 09:46:00 GMT
Call-ID: 3EDB1C4A-B86111E1-94E48F4D-5D7E5E41@172.16.10.74
Supported: timer,resource-priority,replaces,sdp-anat
Min-SE:  1800
Cisco-Guid: 1741963648-0000065536-0000064326-2921883914
User-Agent: Cisco-SIPGateway/IOS-12.x
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
CSeq: 101 INVITE
Timestamp: 1340012760
Contact: <441256748210>
Expires: 180
Allow-Events: kpml, telephone-event
Max-Forwards: 69
Session-Expires:  84600
Content-Type: application/sdp
Content-Disposition: session;handling=required
Content-Length: 354

v=0
o=CiscoSystemsSIP-GW-UserAgent 6030 604 IN IP4 172.16.10.74
s=SIP Call
c=IN IP4 172.16.10.74
t=0 0
m=audio 18110 RTP/AVP 18 0 8 100 101
c=IN IP4 172.16.10.74
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:100 X-NSE/8000
a=fmtp:100 192-194
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16

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"For the love of God is broader than the measure of man's mind And the heart of the Eternal is most wonderfully kind"

[j.huizinga]

Thank you very much!

We are going to configure it like this.

Unfortunately one of our CUBE router has not the forced SIP early offer command, and we need to install more flash and memory and then do an IOS upgrade.

We now make a test with a 2811 that has the correct IOS, but this router has such a weird issue that I think I have to open a TAC case. In this router I can not apply the "bind control source-interface" command. I can type it, but the"show run" doesn't show it. So weird.

We did format flash, install another IOS, but it doesn't apply the bind commands.

Thanks!

Jan

[Ayodeji Okanlawon]

How did you apply the command..Is it like this..

sip

  bind control source-interface gig0/0

  bind media source-interface gig0/0

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"For the love of God is broader than the measure of man's mind And the heart of the Eternal is most wonderfully kind"

[j.huizinga]

Exactly!

but in the show run we don't see it

Thanks,

Jan

[Ayodeji Okanlawon]

What IOS version are you running?

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"For the love of God is broader than the measure of man's mind And the heart of the Eternal is most wonderfully kind"

[j.huizinga]

c2800nm-ipvoice_ivs-mz.124-20.T6.bin

c2800nm-adventerprisek9-mz.124-24.T7.bin

c2800nm-adventerprisek9-mz.124-24.T4.bin

c2800nm-adventerprisek9-mz.124-24.T5.bin

Pick one

We tried all of them.

Thanks,

Jan