[asterisk-users] Exceptionally long queue length (help!)

[Markus]

Help!

I have providers configured that send me incoming calls via SIP. There's 
one that seems to make trouble. As soon as I get a few concurrent calls 
through this peer, Asterisk CPU load goes up to 250%, audio becomes 
laggy and I get hundreds of these per second in the logs:

[Jun 20 20:00:16] WARNING[1206][C-00000001] channel.c: Exceptionally 
long queue length queuing to SIP/provider11-00000001

And the following is what I always get every few seconds for every call 
via this peer. I think this only happens when I'm answering the call in 
Asterisk itself, i.e. right now I'm just streaming MusicOnHold to callers.

[Jun 20 20:00:22] NOTICE[1206][C-00000001] channel.c: Dropping 
incompatible voice frame on SIP/provider11-00000001 of format ulaw since 
our native format has changed to (alaw)

Peer config

[provider11]
host=121.16.15.230
type=peer
insecure=port,invite
context=provider-in
disallow=all
allow=alaw
canreinvite=no
dtmfmode=rfc2833

Before I had

allow=ulaw
allow=alaw

and removed the ulaw codec hoping that the above NOTICEs might 
disappear, but without success.

Asterisk 11.4.0-1 from the official repository under CentOS 6.4 64bit.

Help! :)