SIP Trunk not recognizing DTMF tones

[dereklindo]

Ver 9.1.8

Hi all,

I have an IPO with 2x SIP trunks and 1x PRI. If I dial from the PRI to a number that has an automated attendant, I can perform the key presses fine eg "Press 1 for Sales Press 2 for Accounts etc".

If I dial from either SIP trunk and do the same test, the SIP trunks are not recognizing my DTMF key presses. It just keeps repeating as if I haven't pressed any buttons.

If I plug the SIP trunk (ATA gateway) into a analog basic telephone and perform the same test, it works perfectly.

It appears I need to adjust a setting somewhere in the IPO to recognize my DTMF key presses.

Any suggestions?

NB: The SIP trunks are delivered via ATA gateways and then plugged into analog line ports on the Combo card.

Thanks

Derek

 

[amriddle01]

NB: The SIP trunks are delivered via ATA gateways and then plugged into analog line ports on the Combo card.

Why? That's just silly ...

 

[dereklindo]

lol I know.

That's just the way the local carrier delivered them to the building 8yrs ago and how they were plugged into the previous system.

 

[amriddle01]

Get it changed, no point troubleshooting everything twice over, which you are doing it that way

 

[dereklindo]

Understood. I'm waiting on their IT admin to sort some other things out which won't allow me to be on their network for a few days. I need to resolve this for the interim until I can coordinate with the carrier to move away from the ATA boxes as well as getting access to their network.

Any settings I could take a look at to try and resolve?

 

[IPGuru]

Any settings I could take a look at to try and resolve?

Fix the ATA's/sip trunk configuration they are clearly sending distorted tones



Do things on the cheap & it will cost you dear

 

[dereklindo]

If I plug an analog telephone into the ATA I am able to dial the DTMF tones fine. As soon as I plug the ATA back into the IP Office I can no longer dial numbers and get DTMF tones.

 

[Telecomboy]

You could try impedence matching for the two IPO lines. Since they are really SIP I would run this test if it has not been done yet.

 

[hairlessupportmonkey]

Or make sure the SIP trunk is sending DTMF out of band.

check the settings on the ATA for that.

ACSS - SME
General Geek

 

[dereklindo]

Hi all,

Can you point me towards any settings in the IPO I can check?

Thanks
Derek

 

[IPGuru]

re -reading this Are you connecting an analog trunk on an IP Office to an ATA for your sip trunks?




Do things on the cheap & it will cost you dear

 

[dereklindo]

Yes. I know its not ideal but that is how the Carrier had it installed on the previous Iwatsu system. I just "moved" it over to the Avaya. Everything is working fine except the DTMF tones.

 

[RodneyMcSnow]

Iwatsu and Avaya handle SIP Trunking in different ways, Avaya needs DTMF whereas the Iwatsu dod not.

 

[janni78]

What you mean with Avaya needs DTMF?

Regarding to the issue it depends what the ATA box expects, doesn't want DTMF send as RFC2833, INFO or inband.
This is set on the SIP trunks VoIP tab.

"Trying is the first step to failure..." - Homer

 

[Westi]

This whole discussion is useless I think because the problem is NOT the IP Office and the analog trunks sending the touch tones.
I bet you can just listen into it with the butt set and hear them. Then you tell the provider to fix their crappy ATA's or not use g.729 with inband signaling that has issues intermittently.

I never heard of analog lines not sending touch tones.

Joe W.

FHandw, ACSS (SME)


"This is the end of the world, make sure to buy your T-shirt before it is too late"
Original expression of my daughter

 

[IPGuru]

Yes. I know its not ideal but that is how the Carrier had it installed on the previous Iwatsu system

The re install the system correctly ATA's are simply not intend for this type of usage.
do your customer a HUGE FAVOUR Remove the ATA's & configure the SIP on the IP Office, this will improve the total operation of the system and not just resolve this DTMF issue.



Do things on the cheap & it will cost you dear