Forum Discussion

MattBar_2346481's avatar
MattBar_2346481
SMARTY Pioneer
24-10-2023

No VOIP access

I have a VOIP phone which I have used successfully with a Three SIM in an unlocked router. I've recently switched to Smarty on a recommendation but found that VOIP traffic appears to be blocked. The phone never registers correctly.

With 3 and EE sims, I have no issues. I have a data-only plan and I'm aware that routers may not be "officially" supported, but is this a global thing with the network or something that I may have to look at locally?

The config of the router (ZTE MC801A) hasn't changed apart from the APN settings, but I get nothing from VOIP access.

3 Replies

  • BrianMcBriany's avatar
    BrianMcBriany
    SMARTY Maverick
    25-10-2023

    I don’t have an answer for you but just wanted to make a few points:

    - The access provided via the SIM allows for tethering and I personally know one or two people also using them as a general internet access (4G/5G backup) in their router (Draytek). If there’s some sort of block in place preventing VOIP traffic, I feel that should be clear/presented up front on sign up. If they are blocking, does it fall foul of net neutrality guidance/regs?

    - Could there be an issue with temporarily issued IP/cgnat addressing? Might be worth some googling.

    - Could there be a router setting to be changed? I know my Orbi setup has a few VOIP options to play with.

    • MaDeX's avatar
      MaDeX
      SMARTY Enquirer
      19-06-2025

      Hi mate, do you know if mob.asm.net is all I need - I cant seem to get sim live in the 2865 5g.

  • WelshPaul's avatar
    WelshPaul
    SMARTY Centurion
    21-06-2025

    CGNAT is your problem! APN is only needed when roaming abroad. You could put Mickey Mouse in the APN field while in the UK and data would work just fine.