[Asterisk-Users] Random Dropped Called

[Paul Oster]

I've got a 4 port T1 card in my Asterisk box with a PRI from Qwest as
my PSTN interface.  I'm experiencing random dropped calls on the
various SIP devices I have tested.  Network connectivity to the SIP
devices looks ok, and I have tried a variety of the devices including
all of the following.

Grandstream 286
Grandstresm 486
Sipura SPA 1000
Mediatrix 2102

Some example lines from my logs which may indicate a problem

Jul 15 15:32:41 WARNING[11276]: PRI: !! Got reject for frame 30,
retransmitting frame 30 now, updating n_r!
Jul 15 17:03:20 WARNING[11276]: PRI: !! Got reject for frame 95, but
we only have others!
Jul 15 17:07:44 WARNING[11276]: PRI: !! Got reject for frame 124,
retransmitting frame 124 now, updating n_r!
Jul 15 17:07:44 WARNING[11276]: PRI: !! Got reject for frame 124,
retransmitting frame 125 now, updating n_r!
Jul 15 17:11:56 WARNING[11276]: PRI: Read on 66 failed: Unknown error 500
Jul 15 23:08:37 WARNING[5126]: Maximum retries exceeded on call
c36ae135242165c3 at XXX.XXX.XX.XX for seqno 30406 (Response)
Jul 16 05:39:08 NOTICE[11276]: PRI got event: 8 on span 1
Jul 16 06:25:04 NOTICE[5126]: Request to schedule in the past?!?!
Jul 17 14:43:43 WARNING[11276]: Ring requested on channel 1 already in
use on span 1.  Hanging up owner.

This issue has had me baning my head on my desk for weeks, any
information that you may have that could clear this up will be much
appreciated.

--Paul M. Oster
paulmoster at gmail.com