Hiya, In my (all be it limited!) experience of running SIP over 4g; O2 appear to explicitly block this kind of traffic - I had to run it over a VPN to make it work but once I did this it did work reasonably well with some flexible jitter buffers enabled. It took me a few attempts with wireshark tracing etc to ensure absolutly every bit of the call was going via the VPN. Some of the SIP clients I tried were buggy in this regard - not sending bits of the traffic over the VPN when they should have.
EE dont seem to block it; but I either had to use the orangeinternet APN or a device that supported 464xlat. Hope this helps, Alan On Fri, Jun 12, 2020 at 7:24 PM Gary Steers <[email protected]> wrote: > > Hello, > > Is there anyone on list, or someone who knows someone that could answer the > following question? > > One of my contacts who normally works from home is having major issues with > his broadband not being stable at the moment, so is using 4G as a backup, but > his desk phone will not connect when on 4G (He believes it's on a Gamma > hosted PBX Service but is not sure) > > He has had problems on the following providers > O2 > EE > > Happy to converse off-list. > > Gary
