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SIP TRUNK Codec Passthrough

Unanswered Question
Aug 16th, 2012
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Hello guys,


I would like a support regarding the problem bellow. In summary, I have a SIP trunk to external calls and the provider telco, said to me that they are using G711Alaw codec, but when the call leaves or comming throug the trunk, i receive an information that codec is passthrough. The call is completed but I cannot hear anything from the other side and vice-versa. Could anyone give me some new direction or help on this situation?


Tks a lot!




dial-peer voice 500 voip

translation-profile outgoing

destination-pattern 9T

session protocol sipv2

session target ipv4:10.100.X.X

session transport udp

voice-class codec 11

dtmf-relay rtp-nte

fax protocol pass-through g711alaw

no vad

dial-peer voice 110 voip

description ## CHAMADAS RAMAIS CCMSUB ##

preference 1

destination-pattern 7...

session protocol sipv2

session target ipv4:10.248.X.X

session transport tcp

voice-class codec 1

dtmf-relay rtp-nte

no vad

dial-peer voice 111 voip

description ## CHAMADAS RAMAIS CCMSUB ##

preference 2

destination-pattern 7...

session protocol sipv2

session target ipv4:10.248.X.X

session transport tcp

voice-class codec 1

dtmf-relay rtp-nte



The Call Setup Information is:

Call Control Block (CCB) : 0x2D348A58

State of The Call        : STATE_ACTIVE

TCP Sockets Used         : NO

Calling Number           : +unavailaBle

Called Number            : 7010

Source IP Address (Sig  ): 10.89.0.210

Destn SIP Req Addr:Port  : 10.100.X.X:5060

Destn SIP Resp Addr:Port : 10.100.X.X:5060

Destination Name         : 10.100.X.X


Aug 16 18:47:11.814: //381/9C5CAC0F83C3/SIP/Call/sipSPIMediaCallInfo:

Number of Media Streams: 1

Media Stream             : 1

Negotiated Codec         : Passthrough

Negotiated Codec Bytes   : 0

Nego. Codec payload      : 255 (tx), 255 (rx)

Negotiated Dtmf-relay    : 0

Dtmf-relay Payload       : 0 (tx), 0 (rx)

Source IP Address (Media): 10.89.X.X

Source IP Port    (Media): 16816

Destn  IP Address (Media): 10.100.3.118

Destn  IP Port    (Media): 64624

Orig Destn IP Address:Port (Media): [ - ]:0

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Paul McGurn Thu, 08/16/2012 - 15:05
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What are these two configured with, codec-wise?


voice-class codec 11

voice-class codec 1

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