[asterisk-users] One-way audio after several minutes 1.4.0

[Michael Welter]

Three sites are experiencing ~10sec period of one-way audio.  This 
happens several minutes into the call, and it is very intermittent 
(infrequent).  It does not happen on inter-office calls but only on 
calls to/from the PSTN.

Occasionally, a spurt of white noise precedes the drop-out much like a 
cell phone drop-out.

One site uses one port of a Sangoma A102X (PCI-X).  Another site uses a 
TE110P.  The third site uses a TDM04B (with a TDM10B for the fax 
machine).  All sites operate normally except for this intermittent problem.

Each machine has its USB drivers removed, and there is no sharing of 
interrupts.  I've set interrupt latency on the NICs down to 32.

These machines are dedicated to Asterisk, and there are no other server 
processes (web, mail, etc.).

I was thinking interrupt starvation on the PCI cards.  We upgraded one 
site from a Dell desktop to a Dell server (with A102X), and the problem 
mostly went away but did occur twice on Monday.

The commonality between all sites is Asterisk/Zaptel 1.4.0.  The TDM04B 
site started reporting this problem after the upgrade to 1.4.0.

Thoughts?