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Grandstream GDS3710 Video Door System - One Way Audio

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Pbxnsip Zeta Perseids / Grandstream GDS3710 Video Door System

Problem : when DoorStation makes a call to the pbx and an extension takes that call, there is only audio from the doorstation to the Extension, not the other way around.
When I make a direct IP¨connection from the doorstation to one of the phones, all is well.

Sip log of a call in addendum : could anyone look into this to check what might be wrong ? Any ideas very much appreciated !

Many Thanks,
Marc

Pbxnsip Grandstream Doorphone Sip Log.txt

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Without really looking into the details (this is a pretty old version) the problem will be that the door phone sends a SDP with multiple m-lines, which probably confuses the PBX. What you can try here is to disable the video function on the door phone or make a backup and try and upgrade to version 62 to see if it works there without problems.

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Can I upgrade the Zeta Perseids version to a standard 62 version and have a trial period to see if it works.
I see that the standard version has a 3-month trial period, giving me the time to check out if everything is working ...

Are Snom 320 phones still supported ?

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According to the Grandstream Support, this Video Door Phone is compatible with any third party supporting SIP RFC 3261 standard. Can you tell me from what version Pbxnsip/Vodia supports this standard ?

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LoL RFC3261 has many concepts and ideas, e.g. we would love to see support for the In-Reply-To header from SIP trunk providers. Also SDP is not even in 3261. Anyway, I would just try it out with a demo code on version 62.

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