topic Re: Ip phone will not work over mobile 4g in Mobile Broadband

Ip phone will not work over mobile 4g

Mavmaz — Sat, 02 Sep 2023 12:27:39 GMT

I have a Huawei Model:B535 - 232 with an EE sim.

I have a work phone Mitel 5330 that will not connect. It does work when connected via TalkTalk broadband but the connection speed is slow so I want to connect via 4g.

I just can't see what is blocking it connecting and not obvious where to get diagnostic data?

Re: Ip phone will not work over mobile 4g

Christopher_G — Sat, 02 Sep 2023 14:33:09 GMT

Hi @Mavmaz

Welcome to the community.

Try forgetting all WiFi connections on the mobile, restart both devices and try again. Does it work any better then?

Chris

Re: Ip phone will not work over mobile 4g

Mavmaz — Sat, 02 Sep 2023 16:07:01 GMT

The phone is an IP phone that connects to the 4g router with an ethernet cable.

Re: Ip phone will not work over mobile 4g

Christopher_G — Sun, 03 Sep 2023 07:05:06 GMT

Ah, OK, thanks @Mavmaz

I'm not sure how an IP phone would perform over the mobile network. With fixed broadband, you get a fixed IP address. On the mobile network, we use CGNAT, which means you have a shared public IP address.

Chris

Re: Ip phone will not work over mobile 4g

XRaySpeX — Sun, 03 Sep 2023 08:15:01 GMT

@Christopher_G : I think you mean to say that with fixed broadband, you get a unique IP address. With fixed broadband, you get a dynamic IP address.

@Mavmaz : Is this IP phone on a VoiP network?

Re: Ip phone will not work over mobile 4g

Christopher_G — Sun, 03 Sep 2023 08:17:53 GMT

That is what I meant, @XRaySpeX 🙂

Thank you.

Chris

Re: Ip phone will not work over mobile 4g

Mavmaz — Mon, 04 Sep 2023 06:25:11 GMT

The phone connects to my work telephone network. I guess something run by Mitel? I naively assumed that it would work the same as when on broadband but reading about CGNAT I can see why that might cause an issue with voip. I think there isn't much more I can do.