Calls over PRI T1 disconnect Intermintently

[TheDoz]

I have 2 IP Offices (IP 406 Ver. 3.0(40))connected Via WAN connections Via IP Line. Also at each site thier is a PRI T1 for incomming and outgoing Loacal and L.D. call routing. At one of our sites when they make an outgoing call, it will allow them to dial the number then disconnects, screen on phone returns to normal. This happens for 15 to 30 min. once a day at different times. When I am on site I make several test calls of the number the customer is tring to call and it works every time. And I cant hang around there all day to see if it's going to drop calls or not. SBC says every thing is O.K. on their end and I ran system Monitor on my end and sent text file to Catalyst Tech support and they say its not there problem when they looked at the text file. Customer is getting upset because problem is not resolved.
Any suggestions is appreciated, Thanks

Jack of all, master of none!

 

[magix2kewl]

We had the same issue and it turned out to be a busy signal at the remote end. The Ip office would see a busy and just disconnect. When you tick the Local Busy Tone (default is off) on the telephony tab under System Configuration the IP Office will return a busy to the phone instead of hust going to an Idle state. I believe it has to do with the code being reported back from the CO. Some carriers return a code to the IP Office that is interpreted as a call clear and it just Goes idle rather than playing a busy on the channel. Thus the local busy clears the channel and just plays a busy to the station.

 

[TheDoz]

Thanks you for the info. I will click on that option in System config. And hope they will get a busy instead of dead air. I think they will be happy with that senario.
I hope that I can some day be useful with my knowledge as you have been. Thanks again.

Jack of all, master of none!

 

[weinmatt]

We had this problem at a customer with a ip403 and T1-PRI. They reported randomly dropping of calls. Upgraded them to 3.0 (69) and have no complaints since. Try upgrading to that version.

 

[TheDoz]

Thanks for the info. I will try option 1(Tick Local busy tone)in system>telephony. If that don't do the trick then I will do an upgrade. Thanks for your replies, and just in the nick of time.
Thanks

Jack of all, master of none!

 

[Vmail]

Had the same issue with .40, Tier 3 upgraded to patch 67903, then we upgraded to 3.0.69. It is either the software or the PRI is coming in too hot. The db on the line can effect the PRI in many weird ways.