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Normal Topic Phoner Uses the Wrong Network Interface for SIP Me (Read 209 times)
Cedric Hurst
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Phoner Uses the Wrong Network Interface for SIP Me
06. Jul 2026 at 10:41
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Hello everyone,

I'm running into an issue with Phoner on my laptop, which has three network adapters:

A virtual Cisco VPN adapter
A 100 Mbps Ethernet adapter
A Wi-Fi adapter

The problem is that Phoner appears to use the IP address from the first network adapter when sending SIP messages. As a result, the wrong IP address is included in the SIP packets.

I know I could change the adapter priority, but that's not really an option because other software depends on the current network order and would stop working correctly.

Is there a way to tell Phoner which network interface or IP address it should use without changing the system-wide adapter priority?

Any suggestions would be greatly appreciated.

Thanks!
  
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Re: Phoner Uses the Wrong Network Interface for SIP Me
Reply #1 - 06. Jul 2026 at 13:41
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PhonerLite is using routing information to get the local IP address by the given destination IP address. If your VPN is not using routing, this doesn't work. 

You can compare that with NAT (Network Address Translation). That just patches IP headers. In that case IP addresses within the data of a message keep untouched.

Because of that well known NAT problem, most SIP servers don't really rely on the IP addresses in SIP messages - instead they send messages and voice data to that destination, where packets come from.
  
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