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Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › VoWiFi slow to connect voice
freitasm

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#323281 14-Nov-2025 08:15
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This is a strange one. At home, 2degrees mobile, very good broadband, Wi-Fi is solid.

 

My Android phone is showing the VoWiFi icon. A call comes in, and I answer it. I can straight away hear the other side, but the calling side can't hear me for five to eight seconds, or so it appear.

 

Interestingly, wife's received a call on her phone yesterday, and the same happened.

 

I don't receive many calls - nine calls so far in November - so hard to say if this happens a lot.

 

Both phones are OPPO, different models. We have a small 2degrees tower (Johnsonville West) about 300m from us.

 

Is anyone seeing this?

 

@SaltyNZ any suggestions?




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SaltyNZ
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  #3434370 14-Nov-2025 08:22
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I'm not aware of any issues currently but if you DM me the numbers we can have a look.




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  #3434383 14-Nov-2025 08:50
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I have had issues with more than two VoWiFi on the same connection to the same provider; this is because it uses IPsec where the source port (500) destination port (500) and destination IP were the same for both phones and the router failed to keep the NAT connection tracking working for both.

 

1 phone on Spark and the Other on ONE worked because the destination IP of the IPSec server was different

 

however, my Wife's and My personal phone on ONE it Didn't.

 

I fixed this by having the router (SonicWALL) remap the source port for outbound Nat sessions for the VoWIiFi call servers

 

You can test this is what is causing the issue by having only a single phone on VoWifi on your network and seeing if it works

 

 

 

 




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freitasm

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  #3434385 14-Nov-2025 08:56
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This could be the case. I will have to check daughter's phone is set to VoWiFi as well. Wife wasn't at home when I received one of the calls yesterday, but daughter was.

 

More later.




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freitasm

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  #3434401 14-Nov-2025 09:51
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An update: this could be handset related. More investigation to follow.

 

Thanks, @SaltyNZ




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boosacnoodle
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  #3434846 15-Nov-2025 19:46
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You could’ve described exactly the issue I am facing with Spark Wi-Fi calling on iOS. I’m now wondering if, as said here, this is because we have multiple phones with it enabled on the same network. I’m using UniFi network gear, if that makes any difference.

 

The issue for me is receiving a call and then spending up to 6 or 7 seconds where neither side can talk nor hear each other. 

freitasm

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  #3434848 15-Nov-2025 19:50
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In my case it appears the phone we are using may have not implemented VoWiFi correctly.




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  #3434860 15-Nov-2025 20:41
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Have you tried enabling UPnP? 😂

freitasm

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  #3434863 15-Nov-2025 20:47
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UPnP is not used on this.




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  #3434897 16-Nov-2025 09:38
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boosacnoodle:

 

You could’ve described exactly the issue I am facing with Spark Wi-Fi calling on iOS. I’m now wondering if, as said here, this is because we have multiple phones with it enabled on the same network. I’m using UniFi network gear, if that makes any difference.

 

The issue for me is receiving a call and then spending up to 6 or 7 seconds where neither side can talk nor hear each other. 

 

 

If you are having the same issues as me, you are looking for the equivalent to this tick box on your Unifi as screenshot below (This is on a SonicWALL) for your outbound NAT rules, what this does is randomize the source port when the traffic is NATd to the internet, that way the router can keep the track of NAT sessions and you don't have a duplicate of source port 500, destination port 500, and the same destination IP 

 

 

Note: ONLY apply this rule to the IPsec services of your providers call servers as applying this to all traffic can seriously break other things (Teams Traffic as an example)

 

 




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