Debug ccsip messages

[Pointbreak]

Team,

I am learning SIP. Please consider my doubts. From the below debug

What is the significance of content length. What is the meaning if content length is 0 ?

Is CUbe act as a proxy server here?

And CUCM will do the functon of a registrr server right?

Call setup:

CUCM----------sip trunk------>CUBE---------SIP Trunk--------------->ITSP

INVITE sip:14107154522807@10.105.80.174:5060 SIP/2.0

Via: SIP/2.0/UDP 10.105.80.114:5060;branch=z9hG4bK98e4117d52a6

From: "Solihull" <sip:01214248526@10.105.80.114>;tag=25526~ffa80926-5fac-4dd6-b405-2dbbc56ae9a2-551664735

To: <sip:14107584528207@10.105.80.174>

Date: Mon, 02 Apr 2012 18:12:31 GMT

Call-ID: 68781700-f791ec0f-2d26-e28690a@10.105.80.114

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: <sip:10.105.80.114:5060>;method="NOTIFY;Event=telephone-event;Duration=500"

Cisco-Guid: 1752700672-0000065536-0000007823-0237529354

Session-Expires: 84600

Contact: <sip:01214248526@10.105.80.114:5060>

Max-Forwards: 70

Content-Length: 0

Content-Type: application/sdp

Content-Length: 238

[Deepak Rawat]

Refer to below post where Ayodeji had provided great explanation about SIP traces:

https://supportforums.cisco.com/document/113271/understanding-sip-traces

Regards

Deepak

[Vivek Batra]

1. Content length specifies the length of SDP body (or any other body attached to respective message, in this case it's INVITE).

2. Content length 0 means there is no SDP included in INVITE message which also resembles SIP delayed offer.

3. I wouldn't say CUBE acts as proxy server. Indeed it's B2BUA and always have two independent SIP dialogs.

4. Yes, you can call CUCM as registrar server because it accepts SIP registration from SIP phones.

- Vivek

[BalajiSivaraj49175]

Command used to display the external registrar messages.

Use this command to display the status of E.164 numbers that a SIP gateway has registered with an external primary SIP
registrar.
Example:
Router# show sip-ua register status
Line peer expires(sec) registered
4001 20001 596 no
4002 20002 596 no
5100 1 596 no
9998 2 596 no

[BalajiSivaraj49175]

Command show the statistics of sip messages

Router# show sip-ua statistics
SIP Response Statistics (Inbound/Outbound)
Informational:
Trying 0/0, Ringing 0/0,
Forwarded 0/0, Queued 0/0,
SessionProgress 0/0
Success:
OkInvite 0/0, OkBye 0/0,
OkCancel 0/0, OkOptions 0/0,
OkPrack 0/0, OkPreconditionMet 0/0,
OkSubscribe 0/0, OkNOTIFY 0/0,
OkInfo 0/0, 202Accepted 0/0
OkRegister 12/49
Redirection (Inbound

[BalajiSivaraj49175]

Use this command to display status for theSIPuser agent (UA), including whether call redirection is enabled or disabled.

Router# show sip-ua status
SIP User Agent Status
SIP User Agent for UDP : ENABLED
SIP User Agent for TCP : ENABLED
SIP User Agent bind status(signaling): DISABLED
SIP User Agent bind status(media): DISABLED
SIP max-forwards : 6
SIP DNS SRV version: 1 (rfc 2052)
Redirection (3xx) message handling: ENABLED

[BalajiSivaraj49175]

command to display the current settings for the SIP user-agent (UA) timers

Router# show sip-ua timers
SIP UA Timer Values (millisecs)
trying 500, expires 180000, connect 500, disconnect 500
comet 500, prack 500, rel1xx 500, notify 500
refer 500, register 500