[cisco-voip] Pbx blasting digits time out.

[Philip Walenta]

Just taking a wierd guess here...but since this is a PRI the digits should
be getting signalled over the D channel.  The method that the Mitel is using
is called "overlap sending" which means you'd need to have the router
support "overlap receiving".
 
The unfortunate thing is that this function is not supported on certain
switch types.  
 
Here's a config snippet showing overlap receiving that might help:
 
 
interface Serial1/0:15
description D-channel for ECN-4
no ip address
no logging event link-status
isdn switch-type primary-qsig
isdn overlap-receiving
isdn incoming-voice voice
isdn contiguous-bchan
isdn bchan-number-order ascending
no cdp enable
 
 
Here's a reference for a description of overlap sending:
 
http://www.nmscommunications.com/DevPlatforms/NL/TIN/April2007/SupTip.htm

  _____  

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Richey
Sent: Friday, January 16, 2009 8:14 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Pbx blasting digits time out.



I hope that I can describe this correctly.   I have an IAD2431 that is
connected to an Intertel/MItel 5000 phone system.    I am using the T1
interface to hand the phone system a 16 channel PRI.  The problem is that
the phone system is blasting digits before the IAD can bring up dial tone.
The customer picks up the phone gets dial tone that is generated by the
phone system and they dial 8 + 7 digits.  That dial tone times out, blasts
the 7 digits and the IAD brings up dial tone.  To the caller they hear a
second dial tone which is being generated by the IAD.  During the second
dial tone you can retype the 7 digits and the call will complete.       Has
anyone run into this before?  It's almost like it's a timing issue.

 

The Mitel/Internet tech says they are very limited in what they can change
in their phone system so I have to find a way to make this work.
Finding help with the 2431s has been very difficult because they seem to be
a rare Cisco box.    The majority of my searches end up taking me to someone
who wants to sell me an IAD2431 and the help I can find is pretty much one
site copying another sites text.   I am hoping someone has had a similar
problem with another similar Cisco product.

 

Richey

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