Hi All, we have about 12 x SNOM 710 handsets connected up to a self-hosted V20 3CX via an IPSEC VPN site to site.
We have provisioned them as per the instructions and the phones register and show up in the 3CX system.
However - please see image. If we set the DTMF vio SIP INFO to on or off, the phones cannot make calls.
If we set this to SIP INFO only, then most features work but DTMF does not when you call an external party and are asked to push 1, 2 etc.
Firmware on SNOM 710's is the recommended 3CX one for that model - 8.9.3.96
However, if we take these SNOM's and re-provision at the office where the 3CX actually is, they show up as PNP phones, all features work, but when we take them back to the remote office, because they are provisioned with DTMF vio SIP INFO on, no calls can be made.
To confuse things even more, we also have around 15 Yealink handsets and these all work fine over the IPSEC VPN, including DTMF.
Help appreciated.
Adrian.
We have provisioned them as per the instructions and the phones register and show up in the 3CX system.
However - please see image. If we set the DTMF vio SIP INFO to on or off, the phones cannot make calls.
If we set this to SIP INFO only, then most features work but DTMF does not when you call an external party and are asked to push 1, 2 etc.
Firmware on SNOM 710's is the recommended 3CX one for that model - 8.9.3.96
However, if we take these SNOM's and re-provision at the office where the 3CX actually is, they show up as PNP phones, all features work, but when we take them back to the remote office, because they are provisioned with DTMF vio SIP INFO on, no calls can be made.
To confuse things even more, we also have around 15 Yealink handsets and these all work fine over the IPSEC VPN, including DTMF.
Help appreciated.
Adrian.
