[Asterisk-Users] Cisco 7940 X IAX trunk

[Leonardo Gomes Figueira]

Hi,

I think the choppy sound problem with Cisco 7940/7960 through IAX is 
back... at least when trunk is enabled.

The old issue was:
http://lists.digium.com/pipermail/asterisk-users/2004-April/043280.html

Diagram of the network:

Cisco 7940 -> SIP G.711U -> Asterisk A -> IAX G.729 -> Asterisk B -> 
X100P -> PSTN

With trunk=yes audio to Cisco is choppy. With trunk=no the problem 
disappears.

I tried several combinations of G.711U and G.729 in the SIP and IAX 
links but the problem remains.

Tried calling serveral Asterisk servers (Asterisk A -> Asterisk C, 
Asterisk A -> Asterisk D) and the same problem occurs so it's not 
specific between this 2 Asterisk servers.

This only happens with Cisco 7940. Switching 7940 for an Grandstream 
BT100, Cisco 7905, Avaya 4602, Digium IAXy, Snom 105 or X-Pro the 
problem disappears.

I don't have other Cisco 7940 unit to test but since it make SIP->SIP 
and SIP->ZAP calls with no problem i think the problem is not on the 
device itself.

One difference from the old issue is that the firmware of the Cisco is 
not 6.x, it's 7.x (POS3-07-2-00).

Both Asterisk servers running 1.0.1 release.

Any ideas ?

Is there any test or debbuging i can post to help ?

Thanks,

      Leonardo


Some related configuration:

sip.conf:

[general]
port=5060
bindaddr=0.0.0.0
canreinvite=no
tos=lowdelay

[7940]
context=7940_out
type=friend
username=7940
md5secret=xxxx
accountcode=7940
mailbox=7940
nat=no
host=dynamic
qualify=yes
callgroup=3
pickupgroup=3
disallow=all
allow=ulaw

iax.conf:

[general]
port=4569
tos=lowdelay

[asteriskb]
type=friend
username=asteriskb
host=dynamic
auth=rsa
inkeys=asteriskb
outkeys=asteriska
qualify=yes
context=asteriskb_in
trunk=yes
disallow=all
allow=g729

-- 

  Leonardo Gomes Figueira
  sabbath at planetarium.com.br