RTP Packets always set to true

[TerryJoyce]

Hello,

I am having an issue with my SIP trunk service. They have said that the 3CX system is always sending every RTP event with the marker bit set to true. Is there any way to get 3CX to set the first marker as true and all subsequent packets as false?? Or is my SIP Supplier talking crap?? They are Broadvox.

A bit of background is that when I am trying to dial into a service so the call connects then you type a set of numbers to a few locations the DTMF tones are not being picked up correctly and they say that this is the cause.

Terry

 

[varietel]

What kind of phone(s) are you using? Are you using any ATAs for connection? I had a similar experience using some old Polycom phones. The problem was not the SIP provider or the 3CX. If I understand the scenario from your description the Event Marker bit should be set to true.

Regards,

Roger Partovi
Varietel Communications
3CX Certified Partner
801-889-1414
[email protected]

 

[TerryJoyce]

I am using Cisco 500 series phones.

Where do I set the event markers??

 

[varietel]

I do not know of any place that you can set the event marker yourself. Based on the RFC being used by the phone it should be set properly. I am not familiar with Cisco 500s but in my case one dtmf capability in the sip.cfg file was not enabled for a model of Polycom that I was using. So it was working for making calls and sending dtmf after call connection (for use in IVRs) but it was not working for sending dtmf to activate an overhead pager. Can you check the config file for the Cisco 500? I did google search for Cisco 500 series dtmf and there are multiple posts for dtmf issues with these series of Cisco phones. Have you checked them to see if they are similar to your problems?

Take care,

Roger Partovi
Varietel Communications
Certified 3CX partner
801-889-1414
http://www.varietel.net

 

[SY]

Hello,

I am having an issue with my SIP trunk service. They have said that the 3CX system is always sending every RTP event with the marker bit set to true. Is there any way to get 3CX to set the first marker as true and all subsequent packets as false?? Or is my SIP Supplier talking crap?? They are Broadvox.

A bit of background is that when I am trying to dial into a service so the call connects then you type a set of numbers to a few locations the DTMF tones are not being picked up correctly and they say that this is the cause.

Terry

Hi Terry,

this type of question requires additional information and cannot be discussed using generic words/sentences.
The problem has been described using definitions which are existing on the very low level of protocol stack, so the wireshark capture of the network traffic is required for investigation.

Thanks

P.S. Make a wireshark capture on the PBX host. Please don't post it on the forum because it may contain private information. Send it only using e-mail and only to the person you can trust.