Nortel dropping calls

We have several Nortel BCM phone systems that are connected via IP trunks.   When calls are placed system to system they drop after 15 minutes exactly, every time.  Can't figure out why these calls are dropping.   All of the traffic passes through a Sonicwall NSA 3500.   We've already ruled out TCP timeout issues in the access rules and flood protection settings. Anyone have any suggestions as to what could the be the culprit?
Aaron ConleyAsked:
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Mike RoeCommented:
What BCM systems 200,400, 1000 etc
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Mike RoeCommented:
Check clocking

Resources, Media Bay Modules, Bus 7, Modules on Bus, click on Module 1 and check the Clock Source.  It usually says Master but needs to be set as Primary.  If you change it then the t1 will be disabled for a moment.
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Aaron ConleyAuthor Commented:
The main ones are BCM 400's we also have 2 BCM 50's in the mix.  The problem seems to be with all sites.  They are not connected with T1's so can't be a T1 timing issue.
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Mike RoeCommented:
Can you change those setting and see if it fixes the issue if you have the media bay bus 7
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Mike RoeCommented:
Also on the sonicwall do you have Qos setup
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Aaron ConleyAuthor Commented:
The problem didn't occur until we put the sonicwall into the mix.  Again we don't use any T1's so we don't have a T1 card in any of our BCM's all the IP Trunks go over Ethernet.  We are looking at sonicwall QOS settings and have tried several options but the 15 minute call drop still occurs.  The quality of the call is perfect until it just goes away.
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Mike RoeCommented:
Are they SIP?  If SIP they do not use TCP it is UDP abd there is a timeout for UDP also
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Aaron ConleyAuthor Commented:
The phone systems are pre-sip.  The BCM 400's are on version 3.7.
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Mike RoeCommented:
In the firewall do you have anything related to traffic inspection setup
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Aaron ConleyAuthor Commented:
We found a solution.  We had to create any any access rules in the soncwall for both BCM's and under advanced changed the TCP/IP timeout from 15 min to 360 min.
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Aaron ConleyAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for AARONCONLEY's comment #a39561032

for the following reason:

The solution we finally foud on our own solved the problem.
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Mike RoeCommented:
I pointed him to a direction to look at his access based on UDP and timeouts on firewall related to SIP traffic.

I think this got him moving into this area to create a rule for access
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