Hello!
In your sip.conf use alaw as your first codec option and see what happens.Best 
regards,
Fellipe Paes

Date: Tue, 28 Jun 2011 15:29:11 +0530
From: [email protected]
To: [email protected]
Subject: [asterisk-users] Asked to transmit frame type slin,    while native 
formats is 0x8 (alaw)


Asterisk 1.8.3.2

I have been getting this warning constantly on CLI in a call scenario where I 
use local channels to connect SIP with PSTN. 
I use callfile and local channel to first call a PSTN number and if answered, 
use local channel to call SIP phone with music on hold enabled in Dial string.

If I call PSTN from SIP  directly or vice versa I don't see this warning coming.
On SIP I have allowed only one codec(alaw).

[Jun 28 15:05:00] WARNING[31016] chan_sip.c: Asked to transmit frame type slin, 
while native formats is 0x8 (alaw) read/write = 0x8 (alaw)/0x8 (alaw)



I also tried to yes/no option transcode_via_sln in asterisk.conf without any 
success.
Any idea?
Thanks,
--AM


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