Nortel SL-100 to Cisco Gateway - Programming

[BobW96]

I recently did an installation of a Cisco CallManager system using a Cisco 3845 router to a Nortel SL-100 NT6x50AB PRI. Not being a Nortel guru, I let the local tech do all the programming on the SL-100. Unfortuantely, after 5 days we continued to have what seemed to be a looping issue on the SL-100.

Whenever a call is placed from the SL-100 to the CallManager everything works great. However, when calling from the CallManager to the SL-100 we continously get a Q.921 debug (on the router) reporting back from the SL-100 indicating no channels are available. I can see the attempt going out the trunk to the SL-100 but we see 23 attempts to grab a channel with the same - no channels are available being returned. In addition, when the trunk is monitored on the SL-100, it shows the trunk being active during the call set up but it never passes from the SL-100 to any desktop device.

If anyone has any idea's I'd be grateful. I have a series of screen shots from the SL-100 I can provide if you want to take a look at. Prefer to work one-on-one with that file.

Thank you.

Bob

 

[atascoman]

Did you setup your gateway as an H323 or as an MGCP? I have setup routing between a M1 and a call manager and can give you the programming of the MGCP gateway side. Their is a post on here by John Poole that is a perfect setup for doing a QSIG T1 between a call manager and a Nortel PBX.

 

[BobW96]

Thank you for the reply. Its set up with MGCP on the router to CallManager. I read the thread from John Poole however from what I've also read is the programming between a SL-100 and a M61/81/O11C are different.

Bob

 

[johnpoole]

the sl-100 side has the problem, not with the qsig route but with the cdp.. your sending them x number of digits and they see that as a number on your system.. either they expect more of less digits or they just have a bad entry..

i would monitor the link to see the digits being sent, then dial those exact digits from the nortel and find the loop

john poole
bellsouth business
columbia,sc