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SIP ITSP trunk CUCME 9 SDP Early offer (delayed?)

tonypearce1
Level 3
Level 3

I've been playing with my home lab and I thought that the delayed offer was the default? I've been packet capturing and all of my INVITE messages are using an early offer with the SDP in the INVITE message. Early offer is not enabled globally or on the dial-peer. It seems when I enable it on the dial-peer it doesnt have any effect.

This is not causing a problem other than I'm trying to study, but has anyone else had this?

2 Accepted Solutions

Accepted Solutions

Ayodeji Okanlawon
VIP Alumni
VIP Alumni

Tony,

On CCME the default is early offer. On CUCM the default is delayed offer

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

Please rate all useful posts

View solution in original post

Tony,

As far as I know, you cant change this behaviour in CCME. Howevver for learning purposes here is a trace from CUCM with delayed offer..

15:08:54.149 |//SIP/SIPUdp/wait_SdlSPISignal: Outgoing SIP UDP message to 10.10.10.174:[5060]:


[798651,NET]

INVITE sip:07771900880@10.10.10.174:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.10.74:5060;branch=z9hG4bK2a23125f21dd4
From: "Reception" <01156753001>;tag=106872~ffa80926-5fac-4dd6-b405-2dbbc56ae9a2-485641446
To: <07771900880>
Date: Tue, 11 Dec 2012 15:08:54 GMT
Call-ID: ac560c80-c714c86-bac8-ae28690a@10.10.10.74
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: <10.10.10.74:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 2891320448-0000065536-0000020279-2921883914
Session-Expires:  84600
Contact: <01156753001>
Max-Forwards: 70
Content-Length: 0--------------------------------------------------------------NO SDP in Invite

Looking at the trace you can see that there is no SDP in the invite...This is delayed offer

Now lets compare this to another invite received, this time on CUBE configured to do early offer

Received:
INVITE sip:441127653485@10.100.0.74:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.33.24:5070;branch=z9hG4bK9377fo00cg5ha7l0g3t0.1
From: <07455900064>;tag=1526438727-1338998848384-
To: "voice-lab-aokanlawon"<>441127653485@pbx.emea.ipcom.com>
Call-ID: BW1807283840606121067600210@212.136.178.216
CSeq: 558267841 INVITE
Contact: <07455900064>
Allow: ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,REFER,NOTIFY
Accept: multipart/mixed,application/media_control+xml,application/sdp
Supported:
Max-Forwards: 69
Content-Type: application/sdp-----------------------------------------------------------------SDP included in offer
Content-Length: 207

v=0
o=BroadWorks 161384582 1 IN IP4 10.10.33.132
s=-
c=IN IP4 10.10.33.132
t=0 0
m=audio 11164 RTP/AVP 18 0 8 101
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=fmtp:18 annexb=no

This is the difference...between them

You can look at the doc here to understand more about sip traces..

https://supportforums.cisco.com/docs/DOC-27105

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

Please rate all useful posts

View solution in original post

4 Replies 4

Ayodeji Okanlawon
VIP Alumni
VIP Alumni

Tony,

On CCME the default is early offer. On CUCM the default is delayed offer

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

Please rate all useful posts

Wow, thanks for this!

Is there a way I can force delayed offer? I only wish to capture some traffic and see the difference.

Thanks!

Tony,

As far as I know, you cant change this behaviour in CCME. Howevver for learning purposes here is a trace from CUCM with delayed offer..

15:08:54.149 |//SIP/SIPUdp/wait_SdlSPISignal: Outgoing SIP UDP message to 10.10.10.174:[5060]:


[798651,NET]

INVITE sip:07771900880@10.10.10.174:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.10.74:5060;branch=z9hG4bK2a23125f21dd4
From: "Reception" <01156753001>;tag=106872~ffa80926-5fac-4dd6-b405-2dbbc56ae9a2-485641446
To: <07771900880>
Date: Tue, 11 Dec 2012 15:08:54 GMT
Call-ID: ac560c80-c714c86-bac8-ae28690a@10.10.10.74
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: <10.10.10.74:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 2891320448-0000065536-0000020279-2921883914
Session-Expires:  84600
Contact: <01156753001>
Max-Forwards: 70
Content-Length: 0--------------------------------------------------------------NO SDP in Invite

Looking at the trace you can see that there is no SDP in the invite...This is delayed offer

Now lets compare this to another invite received, this time on CUBE configured to do early offer

Received:
INVITE sip:441127653485@10.100.0.74:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.33.24:5070;branch=z9hG4bK9377fo00cg5ha7l0g3t0.1
From: <07455900064>;tag=1526438727-1338998848384-
To: "voice-lab-aokanlawon"<>441127653485@pbx.emea.ipcom.com>
Call-ID: BW1807283840606121067600210@212.136.178.216
CSeq: 558267841 INVITE
Contact: <07455900064>
Allow: ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,REFER,NOTIFY
Accept: multipart/mixed,application/media_control+xml,application/sdp
Supported:
Max-Forwards: 69
Content-Type: application/sdp-----------------------------------------------------------------SDP included in offer
Content-Length: 207

v=0
o=BroadWorks 161384582 1 IN IP4 10.10.33.132
s=-
c=IN IP4 10.10.33.132
t=0 0
m=audio 11164 RTP/AVP 18 0 8 101
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=fmtp:18 annexb=no

This is the difference...between them

You can look at the doc here to understand more about sip traces..

https://supportforums.cisco.com/docs/DOC-27105

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

Please rate all useful posts

Thank you for this. Here is what I captured yesterday from mine:

Sent:

INVITE sip:07738903450@sip.cloudcalling.co.uk:5060 SIP/2.0

Via: SIP/2.0/UDP 192.168.192.253:5060;branch=z9hG4bKFF3A152B

From: <4247>;tag=74D52EB0-9F1

To: <>07738903450@sip.cloudcalling.co.uk>

Date: Fri, 08 Feb 2013 23:17:59 GMT

Call-ID: 9C9B125C-717C11E2-AD86B5BB-B1C4B41C@192.168.192.253

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 2605367965-1903956450-2910959035-2982458396

User-Agent: Cisco-SIPGateway/IOS-15.2.4.M1

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

CSeq: 101 INVITE

Max-Forwards: 70

Timestamp: 1360365479

Contact: <4247>

Call-Info: <192.168.192.253:5060>;method="NOTIFY;Event=telephone-event;Duration=2000"

Expires: 180

Allow-Events: telephone-event

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 281

v=0

o=CiscoSystemsSIP-GW-UserAgent 6531 5605 IN IP4 192.168.192.253

s=SIP Call

c=IN IP4 192.168.192.253

t=0 0

m=audio 17128 RTP/AVP 116 8 19

c=IN IP4 192.168.192.253

a=rtpmap:116 iLBC/8000

a=fmtp:116 mode=20

a=rtpmap:8 PCMA/8000

a=rtpmap:19 CN/8000

a=direction:passive

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