[Asterisk-Users] Zaptel T1 Timing Source

[Waldo Rubinstein]

Hi guys,

I have a question about the timing source parameter in zaptel.conf.

I have 4 T1s coming into a TE410P.

One T1 is with one carrier, who provides timing signal.

The other 3 T1s are from a different carrier, all sharing the same  
timing signal.

Based on this, I have in /etc/zaptel.conf something like:


span=1,1,0,esf,b8zs
e&m=1-24

span=2,1,0,esf,b8zs
e&m=25-48

span=3,2,0,esf,b8zs
e&m=49-72

span=4,2,0,esf,b8zs
e&m=73-96

What I have done is set the timing source of the first T1 to be the  
primary source for itself.

For the other three T1s, I set the second T1 to be the primary source  
for the group of 3 and the other two as secondary sources.

Is this correct?

The reason I ask is because every so often I hear people complaint  
about call drops. It doesn't happen to everyone, so I don't know if  
it has anything to do with time source selection and synchronization  
issues that may be affecting individual channels. After a report of a  
call drop, I check dmesg and I don't really see any errors. Sometimes  
I just see ... disable echo cancel... messages on specific channels,  
but that shouldn't be a reason to drop a call.

Am I right? Any ideas?

Thanks,
Waldo