WiFi calling, Vodafone - disconnects after 15 min

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Not every single time but most times I am on the phone using Wifi calling, I'll get disconnected at exactly 15 minutes and 0 seconds. It only seems to happen with outbound calls as far as I am aware, but it's not often I'm on the phone for that long in any event. If I disable Wifi calling it's fine (albeit with reduced call quality). Pretty certain it happens regardless of what Wifi network I'm connected to as well.

My phone is a Pixel 7a, fully up to date. Vodafone have been precisely zero help, predictably just trying to blame my ISP or wifi despite being told it happens on any wifi network. Any help welcome...

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Thanks for all the responses.

I work in IT but not really in comms so some of this sounds familiar but not in my field. The phone has two settings for Wifi calling - on, and off. That's it, unless there's a way to get more access under the covers as it were. I don't have another phone to test it with unfortunately.

I know little about SIP but other stuff in the network (e.g. Teams on work laptop) don't seem to have an issue - not sure if that still uses SIP though? I have just found and disabled SIP ALG on my router though so will see if that makes any difference.

Can't see any setting for UDP timeout or NAT refresh rate. The router is a Technicolor thing that I was supplied with when I switched to Zen on Cityfibre. I'm not averse to purchasing a better one if this is potentially causing issues.

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SO disabling the SIP ALG setting on the router didn't help - I had a call drop last night again at exactly 15 minutes

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camel_landy said:

8bit said:

SO disabling the SIP ALG setting on the router didn't help - I had a call drop last night again at exactly 15 minutes

Have you tried it on a different Internet connection, preferably one with a different ISP?

M

Fairly sure it happens at my Dad's place, he's on a totally different ISP. Heading there tomorrow, will try and test.

James6112 said:

Have you tried a different phone, or the existing with no apps running if possible.
Could be phone related. Anti fraud

I don't have another phone to test with.

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jimmyjimjim said:

I was wrong, shame. Bit disappointed that wasn't it.

Ok, what router is it? Can you see what timers you have access to, looking for 900 and 1800 seconds.

It's some Technicolor thing, the web UI reports the model as DGA4134. I couldn't see any timeouts for anything much.

I'm not sure if this is relevant (in terms of specific protocols etc.) but I have no problem with stuff like MS Teams calls for work - I don't use my phone for those though, I have a work laptop for that.