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DTMF not pushing through to Cisco MCU via RMX ISDN

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Frequent Advisor

DTMF not pushing through to Cisco MCU via RMX ISDN

Hi All,

 

I have 2 RMX1500 with both ISDN. If I call a Cisco/Codian MCU via ISDN on the RMX, then I am not able to send DTMF using any device to the MCU participant, nor using the String Extender to push DTMF once the MCU is connected.

 

Can someone please assist on how to resolve DTMF issues on an RMX1500.

 

Regards,

Message 1 of 8
7 REPLIES 7
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Polycom Employee & Community Manager

Re: DTMF not pushing through to Cisco MCU via RMX ISDN

Hello SpattieBall,

 

it helps if you post the current RMX Software Version so yourself or others can check the latest Software Release notes to verify if this is a known issue.

 

Has this ever worked before and has Cisco been contacted to check on their end?

 

Best Regards

 

Steffen Baier

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The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.

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Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
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Message 2 of 8
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Frequent Advisor

Re: DTMF not pushing through to Cisco MCU via RMX ISDN

The Software is currently on 7.8.0 and there is no indication from Cisco Side that this should be a problem.

 

I am however able to send DTMF codes when Dialing straight from an HDX unit over ISDN, but utilizing an RMX as an ISDN Gateway I am not able to send DTMF codes, even trying to use the Dial String when connecting the ISDN number manually in the RMX Meeting Room.

 

Regards,

Message 3 of 8
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Re: DTMF not pushing through to Cisco MCU via RMX ISDN

Hi,

 

This is NOT a Cisco problem and is easy to fix

 

Step 1: On the RMX click on the “Setup” menu on top.

Step 2: Select “System Configuration”

Step 3: Click on “New Flag”

Step 4: Next to new flag add “ALWAYS_FORWARD_DTMF_IN_GW_SESSION_TO_ISDN”

Step 5: Next to Value add “ YES”

Step 6: Click OK

Step 7: Reboot RMX

 

This will solve your problem.

Message 4 of 8
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Frequent Advisor

Re: DTMF not pushing through to Cisco MCU via RMX ISDN

Hi All,

 

My RMX Version 8.1.7.35 and I have 2 of them.

 

One sits in Region X and other in Region Y.

 

Region X can forward DTMF through ISDN calls no problem.

 

Region Y RMX configuration is exactly the same but I cannot forward DTMF through ISDN.

 

I have added the Flag as indicated below but still with no luck.

 

Please can any one assist me?

 

Thanks,


@Burt_Kloppers wrote:

Hi,

 

This is NOT a Cisco problem and is easy to fix

 

Step 1: On the RMX click on the “Setup” menu on top.

Step 2: Select “System Configuration”

Step 3: Click on “New Flag”

Step 4: Next to new flag add “ALWAYS_FORWARD_DTMF_IN_GW_SESSION_TO_ISDN”

Step 5: Next to Value add “ YES”

Step 6: Click OK

Step 7: Reboot RMX

 

This will solve your problem.





Message 5 of 8
Advisor

Re: DTMF not pushing through to Cisco MCU via RMX ISDN

Can anyone confirm what the fix for this issue was?

Message 6 of 8
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Advisor

Re: DTMF not pushing through to Cisco MCU via RMX ISDN

Hi there,

 

To fix the issue I had to do the following:


Add two system flags with the fields:

"GAIN_AUDIO_FOR_DTMF_FORWARDING" = 8

"ALWAYS_FORWARD_DTMF_IN_GW_SESSION_TO_ISDN" = YES


This solved the issue and I can now transmit DTMF via the HDX/Group series to the RMX Gateway call and to the Cisco MCU .etc

 

I noticed you need to do both of these settings, otherwise it does not work.

Message 7 of 8
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Occasional Visitor

Re: DTMF not pushing through to Cisco MCU via RMX ISDN

Hi,

 

The same flags solved the same problem on a 8.4.1 RMX release.

 

Many thanks.

Message 8 of 8