CME 4.1 to CUCM 5.1 SIP Trunk

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Jul 16th, 2008
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I have setup a sip trunk between my call manager and cme. I can call any phone from CUCM to the CME. When I try to place a call from CME to CUCM I am getting a fast busy. Here is by SIP Trunk on the CME side


dial-peer voice 1003 voip

destination-pattern 393

session protocol sipv2

session target ipv4:x.x.x.x

session transport tcp

dtmf-relay rtp-nte

codec g711ulaw

no vad


transfer-system full-consult

transfer-pattern .T

transfer-pattern 8...

transfer-pattern 128..

transfer-pattern 168..


I currently have the destination setup to try and call 1 specific phone for troubleshooting. On my CUCM side I have CSS set, Destination Address, MTP Preferred Origination Codec 711ulaw. Any ideas?

Correct Answer by paolo bevilacqua about 8 years 9 months ago

Just noticed you have "session transport tcp". Please remove that to leave the default of UDP.

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Ayodeji Okanlawon Wed, 07/16/2008 - 09:30
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Please check the following:


1. MRGL that yout sip trunk is assigned has a software MTP in it


2. The CSS on the inbound calls on your sip trunk has the partiton of your ip phones in it

wbarren Wed, 07/16/2008 - 09:40
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I have confirmed that the SIP trunk:


MRGL has a software MTP in it

CSS for inbound calls is in the partition of my phones.

paolo bevilacqua Wed, 07/16/2008 - 12:46
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Hi, "393" doesn't seem right as destination-pattern. Suppose CM extensions all start with 3 and are four digits, "3..." would be right.


In any case, take "debug ccsip message" with "term mon" when calling. That will show numbers and causes.

wbarren Wed, 07/16/2008 - 16:23
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All the ext on the CUCM side are 3 digits. I have the destination-pattern set for 393 because I was testing with 1 extention for troubleshooting.

paolo bevilacqua Thu, 07/17/2008 - 01:08
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Then collect the debug trace as mentioned above.

Correct Answer
paolo bevilacqua Thu, 07/17/2008 - 01:50
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Just noticed you have "session transport tcp". Please remove that to leave the default of UDP.

paolo bevilacqua Thu, 07/17/2008 - 05:24
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Thanks for the appreciation and good luck!

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