Polycom IP500 Forward problem codec issue
All,
I’m running the Polycom IP500 phones at several sites. My * server is at a collocation site and I have complete control of the T1’s running to the remote sites with the IP500 phones. Connectivity to the PSTN is through a Cisco 2600 with a PRI card. During initial testing I ran G711/ulaw but have added G729 licenses to the system.
Problem: When the forwarding function on the Polycom phones is enabled the forward/transfer does work but the caller does not hear any ringing. During the time that the caller should hear ringing the * console produces pages of errors.
<snip>
…..
Apr 30 08:41:03 NOTICE[2813]: channel.c:1314 ast_read: Dropping incompatible voice frame on Local/[EMAIL PROTECTED],2 of format g729 since our native format has changed to ulaw
Apr 30 08:41:03 NOTICE[2813]: channel.c:1314 ast_read: Dropping incompatible voice frame on Local/[EMAIL PROTECTED],2 of format g729 since our native format has changed to ulaw
…..
</snip>
I have tested this with the phones behind a PIX firewall with NAT, behind a PIX firewall without NAT, and without a firewall at all. Nat is not the problem.
In the SIP.conf canreinvite=no so all traffic should be passing through the * server.
The problem seems to be in the translation of the G729 packets from the phone to the G711 packets to the router. Only during the forwarding process is this a problem.
Here is a snip from the console when it worked.
(Note: it worked because I was ringing two phones with this line in my extensions.conf
(exten => ------6081,1,Dial(SIP/------6081&SIP/------6091,20)
=========<SNIP>
-- Executing Goto("SIP/---.----.241.35-40400490", "TPN|------6081|1") in new stack
-- Goto (TPN,------6081,1)
-- Executing Dial("SIP/---.---.241.35-40400490", "SIP/------6081&SIP/------6091|20") in new stack
-- Called ------6081
-- Called ------6091
-- Got SIP response 302 "Moved Temporarily" back from ------.92.27
-- Now forwarding SIP/---.---.---.35-40400490 to 'Local/[EMAIL PROTECTED]' (thanks toSIP/------6091-6268)
-- Executing Dial("Local/[EMAIL PROTECTED],2", "SIP/[EMAIL PROTECTED]") in new stack
-- Called [EMAIL PROTECTED]
-- SIP/------6081-e558 is ringing
-- SIP/---.---.241.35-f522 is making progress passing it to Local/[EMAIL PROTECTED],2
-- Local/[EMAIL PROTECTED],1 is making progress passing it to SIP/---.---.241.35-40400490
-- SIP/---.---.241.35-f522 answered Local/[EMAIL PROTECTED],2
-- Local/[EMAIL PROTECTED],1 answered SIP/---.---.---.35-40400490
== Spawn extension (TPN, ------6081, 1) exited non-zero on 'Local/[EMAIL PROTECTED],2<ZOMBIE>'
-- Attempting native bridge of SIP/---.---.241.35-40400490 and SIP/---.---.241.35-f522
==========</SNIP>
Now here is the console output with a single phone defined in the extensions.conf
(exten => ------6081,1,Dial(SIP/------6091,20)
*********<SNIP>
Asterisk-A*CLI>
-- Executing Goto("SIP/---.---.241.35-40418730", "Charity|------3263|1") in new stack
-- Goto (Charity,-------263,1)
-- Executing Dial("SIP/---.---.241.35-40418730", "SIP/------3263|18") in new stack
-- Called ------3263
-- Got SIP response 302 "Moved Temporarily" back from ---.---.243.5
-- Now forwarding SIP/---.---.241.35-40418730 to 'Local/[EMAIL PROTECTED]' (thanks to SIP/------3263-f670)
-- Executing Dial("Local/[EMAIL PROTECTED],2", "SIP/[EMAIL PROTECTED]") in new stack
-- Called [EMAIL PROTECTED]
-- SIP/---.---.241.35-36ca is making progress passing it to Local/[EMAIL PROTECTED],2
-- Local/[EMAIL PROTECTED],1 is making progress passing it to SIP/---.---.241.35-40418730
Apr 29 11:30:03 NOTICE[2197]: channel.c:1314 ast_read: Dropping incompatible voice frame on Local/[EMAIL PROTECTED],2 of format g729 since our native format has changed to ulaw
…
…<pages of the same error>
…
Apr 29 11:19:18 NOTICE[2185]: channel.c:1314 ast_read: Dropping incompatible voice frame on Local/[EMAIL PROTECTED],2 of format g729 since our native format has changed to ulaw
-- SIP/---.---.241.35-4e1f answered Local/[EMAIL PROTECTED],2
-- Local/[EMAIL PROTECTED],1 answered SIP/---.---.241.35-40400490
-- Attempting native bridge of SIP/---.---.241.35-40400490 and SIP/---.---.241.35-4e1f
== Spawn exten (Charity, -------0059, 1) exited non-zero on 'Local/[EMAIL PROTECTED],2'
*********</SNIP>
I’m sure I could change everything to ulaw G711 the problem would go away but I do not want to do that.
Any Ideas?
Thanks Scott H
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