Hi all,
I wonder if anyone can help.
We have a weird issue with our XG firewalls and SIP traffic. We set the firewalls up according to our SIP providers information and calls are working perfectly ina nd out. However when an external caller dials in they don't get the usual 'ringing' noise at their end to let them know the call is going through; it's just silent.
I got on to Sophos support aout the issue (after speaking to our SIP provider whoc onfirmed as far as they are converned everything is set up correctly) and they suggested enabling the SIP module that comes with the firewalls. (It had been disabled per the instructions from our SIP provider). This did in fact resolve the issue of the 'ringing' sound when an external caller dialled in, but caused another issue in that there was then no audio on the call either way... Frustrating.
I have asked support if it's possible to 'recreate' what the SIP module does using firewall rules, as clearly it does something that resolves our issue. I haven't had a reply.
Has anyone else experinced this issue before? Our phone system is on-site; not a hosted system.
This has been going on for months now and noone seems to be able to get to the bottom of it. I now need it resolving as it makes us look very unprofessional.
Thanks in advance.
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