How to force UDP Transport?

[TierList123]

I have my own edited script which I use to auto-provisions phones for 5 Yealink T33's - However, by default they provison the phone to use TCP. What entry do I need to input below to force the phones to use UDP transport when they register? They are all registerd as "Direct SIP(Stun - remote).

 

[JohnS_3CX]

Hi @TierList123

Just wondering why you think they would use TCP by default?

1. The template screenshot shows that there is no value assigned there telling it to use TCP

2. As far as I'm aware our currently supported firmware does not default to TCP (both before and after provisioning)


Question: did you perhaps manually set TCP at some point and then forgot to reset the phone to factory default?

 

[TierList123]

Hi There, I set them to UDP as TCP was not registering on the clients network (They were originally setup as TCP to be used over LTE) but since they client is not on fibre, I've set it to UDP, and now they register on UDP over fibre. Since then, the phones have rebooted while my provisioning script was loaded and when I logged back into them earlier today, they were back on TCP again....

Please tell me what value I can put into those transport_type fields in order to allow for registration on UDP.

 

[JohnS_3CX]

It sounds like the provisioning script is probably doing this.

I would recommend the following actions:

1. Ensure they are running the 3CX Supported firmware

2. Factory reset them to clear everything back to defaults (not just reboot)

3. Avoid using your provisioning script, and instead provision them using the default 3CX template as per our guide


The expected result is that the phone should provision and use UDP transport

 

[TierList123]

It sounds like the provisioning script is probably doing this.

I would recommend the following actions:

1. Ensure they are running the 3CX Supported firmware

2. Factory reset them to clear everything back to defaults (not just reboot)

3. Avoid using your provisioning script, and instead provision them using the default 3CX template as per our guide


The expected result is that the phone should provision and use UDP transport

Thanks a lot. I will definitely do that. If I wanted to hypothetically speaking, register them as UDP with my script, what value can I place in transport_type field next to the = sign to allow for UDP transport?

 

[JohnS_3CX]

I'm not aware but, based on what you said above, I suspect your script had the transport_type field included.

If were to not include it at all, a reset phone would almost certainly remain in UDP (since it's the default)