asterisk users - Sep 2003 - TE410P timing and multiple, different spans

Greetings...

I have a TE410P with four T1's going into it.  Things look roughly like 
this:

#1	Goes to PBX -- we're responsible for timing
#2	E&M span to telco 1
#3	PRI span to telco 1
#4	PRI span to telco 2

If I set primary sync source to span 2, users report strange echo, 
distortion, and crosstalk problems, which sound remarkably like frame 
slippage on spans 3 and 4.  If I set it to use #3 as primary, the other 
spans report problems, etc.  Generally, it seems like the clocks just 
aren't quite close enough to make things work right all of the time.  I 
don't forsee either involved telco doing anything at all about this.

Is there any way to see if there is some sort of weird timing problem?  
Even better, is there a way to get things to work right on the TE410P?

Thanks :-)  -rt

-- 
Ryan Tucker
Network Engineer
NetAccess, Inc.
1159 Pittsford-Victor Road
Bldg. 5, Suite 140
Pittsford, New York 14534
585-419-8200
www.netacc.net