One Way Audio On Outgoing Calls

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    I am having a strange problem with a new provider.  We already have a couple SIP trunks working fine.  We are trying a new provider but we are having one way audio problems with outgoing calls.  Incoming calls do have two way audio, only outgoing calls have this problem.  I do not see anything odd with a packet capture and using PJSIP history to check.  The provider says that on outgoing calls the get random characters instead of the media port for RTP.

    We are using Asterisk 16.12.0 with PJSIP.  The server is behind NAT
so we have external_media_address and external_signaling_address set to the public IP and all relevant ports are forwarded to the Asterisk server.  The other SIP trunks work fine, only this new provider has a problem and only for outgoing calls.

    An rtp set debug on shows only outgoing packets to the media address but no incoming packets.  Why would there be a difference that makes it work on incoming calls but not on outgoing?

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Telecomunicaciones Abiertas de México S.A. de C.V. Carlos Chávez
+52 (55)8116-9161

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One thought on - One Way Audio On Outgoing Calls

  • Hi Carlos

    Le 07/08/2020 à 06:33, Carlos Chavez a écrit :

    We faced this problem and it was a firewall issue on our side. But if you say that your provider doesn’t get the RTP, I understand that they can’t return anything. RTP ports ?

    Cheers

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    Daniel

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