Help needed with Session Description Protocol (SDP) on a Cisco CUCM 8.6.2

[tony000031]

I need your help.  I have been having issues with CUCM 8.6.2.

When I calls out it rings until the person answers, then it give me a busy signal.  When someone calls from the outside, I pickup and nothing happens.  At the same time they will get a busy signal.

Thanks in advance for your help

[Ayodeji Okanlawon]

Can you describe what's involved in your solution. What is the call flow?

[tony000031]

I should of  mentioned that we changed Service Providers. We also are trying to establish a SIP on out network as well.

[Ayodeji Okanlawon · Accepted solution]

So what is your call flow?

Cucm>>>sip>>>cube>>>sip>>>itsp?

Or do you have a direct sip trunk between cucm and itsp

[tony000031]

Sorry hit the wrong button.

It goes CUCM>>>sip>>>cube>>>sip>>>sp mpls router>>>sip>>>itsp..

There is a Cisco 2921 VG router in between the redundant core switches and the SP MPLS router.  The 2921 VG router has three GE ports. 

I believe I need to configure SIP-UA with disable early media 180 on that 2921 VG router.

[Ayodeji Okanlawon]

Why have you come to such a dramatic conclusion?

Please send a debug ccsip message from the cube. Include the calling and called number. Also send your sh run

[tony000031]

After looking at the configurations and finding out this a piece was missing.

The old call flow was like this:  Old SP Cube router had two Gig-E ports

CUCM>>>sip>>>Cube>>>sip>>>itsp

New Service Provider router didn't provide two Gig-E ports.  

New Call Flow.

CUCM>>>sip>>>VG router>>>sip>>>SP mpls router>>>sip>>>itsp.

The VG router is only passing traffic and providing an two Gig-E connection to each core switch.  SP MPLS router is configured to handle all SIP traffic (All voice voices, dial-peers, etc.). 

I don't have copy of the SP router

[Ayodeji Okanlawon]

Tony,

Okay so your new voice gateway is just doing ip routing to the SP MPLS router. Your cucm sip trunk is pointing to the MPLS gateway ip address.

In this case there are two options to troubleshoot this.

1. CUCM collect traces

2. Contact Service provider since you do not have access to their gateway.

If you can collect cucm traces, then we may be able to see what is going on.

[tony000031]

Are you asking if my CUCM SIP trunk is pointing to SP MPLS gateway IP address? 

I will do collect the trace from the CUCM tomorrow.

I am waiting for the configuration from the SP MPLS router.

[Ayodeji Okanlawon]

Yes. In this scenario, your cucm sip trunk has to be pointing to the MPLS gateway ip. Is it not?

[tony000031]

Yes, my CUCM SIP trunk is pointing the the MPLS gateway IP address.

[tony000031]

Here is the text file from my collect trace..

[tony000031]

After looking at the trace files.  I get this error.  

400 bad request - malformed cc-diversion + cc-redirect links

Currently the header is set to PAI.  

[Ayodeji Okanlawon]

The diversion header is not set properly. It looks like your service provider has configured a wrong sip profile on the diversion header. Its missing a closing ">"

This is what is in the sip header...

Diversion: <sip:9512146397@smartvoice.telepacific.com

This is what it needs to be

Diversion: <sip:9512146397@smartvoice.telepacific.com>

You need to contact them and bring this to their attention
 

[tony000031]

Should the header be set to default or PAI?

Thank you again