SNOM D735 - How enable SIP using TCP without creating custom template

[Manuskysurfeur]

Hello all,

We noticed that our IP phones SNOM D735 is working better using SIP TCP instead SIP UDP trough our SD-WAN infrastructure.

I'm able to switch to SIP TCP using custom template but I prefer use the original template in order to have 3CX support...

Do ou know how I can enable SIP using TCP on my IP phones without creating custom template ?

Regards,

 

[KonnectCraft]

3CX already supports both TCP/UDP 5060 for SIP traffic. https://www.3cx.com/docs/ports/

When you say working better, what are the issues you're facing with UDP? You should probably run a packet capture and see what's causing the issues instead of just switching to TCP. UDP is generally preferred protocol for VoIP because of its lower overhead compared to a TCP packet.

 

[Manuskysurfeur]

Hello,

My question is : Do you know how I can enable SIP using TCP on my IP phones without creating custom template ?

It's not to troubleshoot the issue using UDP. I've already done it.
Our remote sites (70) are linked to our datacenter using SD-WAN.
Our SD-WAN is composed with 2 or 3 WAN links.
The problem with SIP using UDP is that UDP session on port 5060 never expire.
Once the UDP session is established on a WAN link, if this WAN link goes down, our SD-WAN gateway doesn't switch the session to the second WAN link because the UDP session never expire....
Using SIP with TCP, the session expires. So our SD-WAN gateway switch the session to the second WAN link once the TCP session is expired.

That's why I want to use SIP with TCP and not UDP, but the default templates for SNOM only use UDP.

Regards,

 

[KonnectCraft]

Unfortunately, at this point there is no way to do this without creating custom templates as far as I know.

There was a thread a while ago with that feature request. Maybe post it on ideas forum (https://www.3cx.com/community/forums/3cx-ideas/index.php) and see if 3CX team would accommodate that in their features if there's enough demand. It should be something simple enough to implement on their end.

 

[JohnS_3CX]

Hi,

Your case appears to have specific needs, so a custom template was the way to go.

3CX does not provision that part, so there is no way to change it at the moment.