No Ring On-Net Calls

[jcostlow]

I have made a ticket with the SIP trunk provider as when we make on net calls to other customers there is no ringing until answered. At first we didn't care but as we have moved more customers over they are noticing and think the call isn't going through since there is no ringing.

Net2Phone has asked "can you ask the origination carrier if their pbx supports getting a 183, and then a 180? We need to know why the originating side is not able to handle the 180 Ringing after the 183." Below is screenshot showing the 183 session progress come before 180 ringing.


Here is a call off network where I do hear ringing.


Would the 180 ringing coming after 183 session progress not be processed causing us to not hear the ringing?

 

[YiannisH_3CX]

Hi @jcostlow

Would the 180 ringing coming after 183 session progress not be processed causing us to not hear the ringing?

That is indeed the case with 3CX. If a 183 is received followed by an 180 then the 180 is ignored. I wonder why the provider is sending both however and what the 183 contains. Do you hear a prompt coming from the provider or anything else when dialing out?

 

[jcostlow]

I don't hear anything once the call is placed. It is just dead silence until a person or VM/DR answers. Below is what is in the 183 before receiving a 180


I will update my ticket with Net2Phone and see if they will tell me why they send 183 before 180

 

[YiannisH_3CX]

I tried to replicate your issue but could not with Net2Phone. I either receive an 183 and i hear ringing or an 180 and I again hear ringing.
You should ask them anyway to see what they are going to say

 

[jcostlow]

I have updated my ticket with them and will keep you posted. This only happens when calling other Net2phone customers.

I get 183 or 180 and ringing if I call from my net2phone account to another carrier. But if I call from my net2phone account to a customers net2phone account there is no ringing. I can replicate that from any of our customers PBX as well.

 

[YiannisH_3CX]

That is strange. I did try calling a second Net2Phone number as well but couldn't replicate. Anyway let see what they say first.

 

[jcostlow]

Net2phone made some change to our agent account so I now hear ringing for on net calls. They wouldn't tell me what but now I am having to get the same thing done to other customers accounts.

 

[YiannisH_3CX]

Its good to see that Net2Phone was able to assist you although it would be nice to know what they did so other users might benefit. Hopefully they can do the same for all customers.