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Community Member

How can I configure to send SDP in 180 or 183?

On Cisco trunk within Cisco CUCM how can I configure to send SDP in 180 or 183? We have enabled early media. I can send more info if this is not a direct setting/configuration change.

7 REPLIES
VIP Super Bronze

Why do you want to send SDP

Why do you want to send SDP in 183? What are you trying to achieve?

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Community Member

Maybe you need to add PRACK

Maybe you need to add PRACK support on CUCM Trunk.

Have you tried to change the SIP Profile? Under "SIP Rel1xx Options" choose enable.

Regards,

 

Ulderico

Community Member

I tried this and nothing

I tried this and nothing appears to change. This may be a piece of the issue though, not sure. I appreciate it.

Community Member

My suggestion is to collect a

My suggestion is to collect a packet capture on CUCM and the see what is going on with SIP. Furthermore, have you tried to put a flag the "MTP required" field? Sometimes helps.

Ulderico

 

Community Member

You should use a custom SIP

You should use a custom SIP Profile applied on the SIP Trunk versus IVR.

In this custom SIP Profile, try to enable PRACK support, under "SIP Rel1xx Options" choose "Send PRACK for all 1xx messages".

 

Regards,

 

Ulderico

 

Community Member

We configuring an IVR system

We configuring an IVR system with a third party. This third party cannot connect the audio streams after transferring call (not a true transfer just trying to tie 2 trunks together on their end). They are telling us to troubleshoot further that there should be SDP sent in 183 from CUCM. Right now it is:

IVR <--> CUCM

> INVITE SDP

< 100 Trying

< 180 Ringing

< 200 OK SDP

> ACK

< RTP

 

They are telling us they need SDP sent before the 200 OK on either 180/183.

Community Member

This is resolved via patch on

This is resolved via patch on 3rd party IVR server. 

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