ISP SIP Trunk Issues

[Joseph E Spoon]

Hello, we are installing a new SIP trunk from our ISP to replace our PRI.  With the setup the way we have it we are getting ring no answer on inbound calls and fast busy on outbound calls.  The ISP has a Cisco 2900 router that is NATing over to our Cisco 2851 with advipservices firmware.  Behind our Cisco 2851 we have CUCM 8.0.  What could be causing our issues?  Attached is the configuration in the voice gateway.  The ISP Router has the public IP and is NATing the traffic across to 130.0.100.1.  Then there is an outbound dial-peer going to the call manager.  The phone will ring, but the calling party just hears endless ringing even if the called party picks up the phone.  I've only been testing one number since we don't have all of the numbers ported over, i have it translated with a num-exp value.  Also, it works with a phone plugged directly into an FXS port.

[Joseph E Spoon]

Attached are the results of the debug with the registration removed from sip-ua.

Thanks for your help.

[brmeade · Accepted solution]

It's just sending UDP invites out over and never gets a response.  Are you sure you have the IP address right?  Also, do they expect TCP or UDP?

[Joseph E Spoon]

I believe I do have the IP addresses correct for their equipment.  I'm not onsite, I'm checking now to make sure everything is powered up since this isn't running live.

Thanks

[Joseph E Spoon]

Attached is the latest debug I ran.  The cabling to the Telco Router had been unplugged for some reason so that's why it wasn't communicating before on my previous debug.  I'm still getting a fast busy on outbound calls but it waits a few seconds before it gives the fast busy

[Ayodeji Okanlawon]

The debug is incomplete. We only see the outbound INVITE...Pls post the full debugs

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

[Joseph E Spoon]

I'm testing on the live network now so please disregard the prevoius post.  I am getting a 503 service unavailable.  A fastbusy on outbound calls and I see no SIP traffic between my CUBE and the telco's equipment.  Below is the debug in it's entirety for the call

Sep  4 22:22:20.198: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:

Received:

INVITE sip:92566138703@130.0.100.1:5060 SIP/2.0

Via: SIP/2.0/TCP 130.0.100.146:5060;branch=z9hG4bK4051db5294

From: <2565476386>;tag=1f4823e6-e05d-4f53-ab96-a322c4ecf282-27

142664

To: <92566138703>

Date: Wed, 04 Sep 2013 22:22:20 GMT

Call-ID: 7569fb80-2271b29c-2b-92640082@130.0.100.146

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

Min-SE:  1800

User-Agent: Cisco-CUCM8.0

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

NOTIFY

CSeq: 101 INVITE

Contact: <2565476386>

Expires: 180

Allow-Events: presence, kpml

Supported: X-cisco-srtp-fallback

Supported: Geolocation

Call-Info: <130.0.100.146:5060>;method="NOTIFY;Event=telephone-event;Duratio

n=500"

Cisco-Guid: 1969879936-0000065536-0000000043-2456027266

Session-Expires:  1800

P-Asserted-Identity: <2565476386>

Remote-Party-ID: <2565476386>;party=calling;screen=yes;privacy

=off

Max-Forwards: 70

Content-Length: 0

Sep  4 22:22:20.214: //39335/7569FB800000/SIP/Msg/ccsipDisplayMsg:

Sent:

SIP/2.0 100 Trying

Via: SIP/2.0/TCP 130.0.100.146:5060;branch=z9hG4bK4051db5294

From: <2565476386>;tag=1f4823e6-e05d-4f53-ab96-a322c4ecf282-27

142664

To: <92566138703>

Date: Wed, 04 Sep 2013 22:22:20 GMT

Call-ID: 7569fb80-2271b29c-2b-92640082@130.0.100.146

CSeq: 101 INVITE

Allow-Events: telephone-event

Server: Cisco-SIPGateway/IOS-12.x

Content-Length: 0

Sep  4 22:22:20.226: //39335/7569FB800000/SIP/Msg/ccsipDisplayMsg:

Sent:

SIP/2.0 503 Service Unavailable

Via: SIP/2.0/TCP 130.0.100.146:5060;branch=z9hG4bK4051db5294

From: <2565476386>;tag=1f4823e6-e05d-4f53-ab96-a322c4ecf282-27

142664

To: <92566138703>;tag=32D99D64-5B5

Date: Wed, 04 Sep 2013 22:22:20 GMT

Call-ID: 7569fb80-2271b29c-2b-92640082@130.0.100.146

CSeq: 101 INVITE

Allow-Events: telephone-event

Server: Cisco-SIPGateway/IOS-12.x

Reason: Q.850;cause=38

Content-Length: 0

Sep  4 22:22:20.226: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:

Received:

McCartney_R1#ACK sip:92566138703@130.0.100.1:5060 SIP/2.0

Via: SIP/2.0/TCP 130.0.100.146:5060;branch=z9hG4bK4051db5294

From: <2565476386>;tag=1f4823e6-e05d-4f53-ab96-a322c4ecf282-27

142664

To: <92566138703>;tag=32D99D64-5B5

Date: Wed, 04 Sep 2013 22:22:20 GMT

Call-ID: 7569fb80-2271b29c-2b-92640082@130.0.100.146

Max-Forwards: 70

CSeq: 101 ACK

Allow-Events: presence, kpml

Content-Length: 0

[Joseph E Spoon]

After looking at this closer, the ISP had given me an incorrect IP  address.  I corrected this and made a few dial-peer changes and calls  are now completing outbound.

Thanks all for your help with these issues.