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Call Relay – codec transcoding

Viewing 7 posts - 1 through 7 (of 7 total)
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  • 12th July 2008 at 19:18 #31811
    Tim
    Guest

    Hi,

    Can anyone tell me if the Quintum Tenor Call Relay products offer codec transcoding? If a call arrives at a Call Relay offering G.723, and the destination only supports G.729, will the Call Relay decode and re-code the audio or will the call fail?

    At the moment, I am achieving this transcoding function using a Tenor DX gateway with E1 ports looped back. That’s obviously not a good use of the equipment and I would rather deploy the DX gateways for E1 termination elsewhere and replace them with Call Relays.

    Also, with the call relay, does T.38 fax work if it supported by the caller and called party, or just by one party? And lastly, how about DTMF? If the calling party sends out of band DTMF signalling (H.245 UserInputIndication) and the called party only supports in band, will it work?

    Is there any other equipment I should think about for this function? Someone told me that Welltech support VoIP in / VoIP out.

    Thanks.

    14th July 2008 at 12:28 #31812
    MikeM to Tim
    Guest

    The Call Relay will not support transcoding. Whatever codec is received will be sent. It will support T.38, but both parties must also support it. I believe the same will be for the H245 digit relay.

    MikeM
    mike_voip@hotmail.com

    14th July 2008 at 19:12 #31813
    Tim
    Guest

    Thanks MikeM. That’s what I suspected. I’ll stick with my current architecture. It just seems so wasteful.

    14th July 2008 at 20:48 #31814
    Tim
    Guest

    Sorry, one more thing MikeM. I assume Remote NAT (NAT traversal) works for calling parties behind NAT on the Call Relay in the same way as the DX gateways?

    15th July 2008 at 12:11 #31815
    MikeM to Tim
    Guest

    Yes and No.

    One use for the call relay is when you have multiple gateways behind a NAT, but only one public IP. You can put the call relay behind that NAT with the public IP assignment and then the call relay, as it receives calls from public IP, can route to the correct gateway on the private IP.

    MikeM
    mike_voip@hotmail.com

    15th July 2008 at 17:53 #31816
    Tim
    Guest

    Thanks. Does that work the other way round? If the Call Relay has a fixed public IP address and the calls arriving from endpoints behind NAT, will the audio get back to the caller OK? This is the Remote NAT feature on the DX that works really well.

    16th July 2008 at 17:30 #31817
    MikeM to Tim
    Guest

    The audio issue needs to be resolved by the unit behind the NAT, not anything on the public network. So if the device is a quintum behind NAT, then, in most cases, there should be no problem.

    MikeM
    mike_voip@hotmail.com

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