Soft phone registers with wrong sip port and causes silent call

[vuthy09]

Soft phone registers with wrong sip port with 5960 and causes silent call, help please why it happens like that?

 

[hfoster]

That's not wrong, SIP clients can use any ports they wish using rport. Otherwise you would only be allowed to use one SIP client per IP address.

Does that network have some sort of SIP ALG enabled? If so disable it.
Also arbitrary port blocking rules for UDP? If so, whitelist the PBX address.

 

[whut]

I have not used the soft phone application you are using, but GS wave (end of life product) has no audio on UDP. TCP or TLS were required for audio.

 

[vuthy09]

That's not wrong, SIP clients can use any ports they wish using rport. Otherwise you would only be allowed to use one SIP client per IP address.

Does that network have some sort of SIP ALG enabled? If so disable it.
Also arbitrary port blocking rules for UDP? If so, whitelist the PBX address.

Where to check for SIP ALG? and where to put PBX address into whitelist?

 

[hfoster]

Depends on the router that network is on. You might find it more reliable to switch the client to TCP, routers handle it better.

This is all implying the PBX and the phones are on different networks.