DTMF Issue with 7960 and Analog Phones

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Feb 25th, 2009
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We are running IOS 12.4(3g) with CME 3.3 on Cisco 2811 routers. The router is connected to analog phone lines via FXO ports and we have a few analog phones connected via FXS ports and the IP phones are 7960. The issue is that when a 7960 phone conferences in one of the analog phones on the CME the 7960 phone is no longer able to pass DTMF tones to navigate through IVRs etc. The DTMF phones from the analog phones connected to the FXS ports work fine. Has anyone ran into this scenario and does anyone have a resolution?

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Nicholas Matthews Wed, 02/25/2009 - 09:38
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Hi Brandon,

In order for DTMF to be supported through a CME conference, you will need to configure hardware conferencing on CME.

This includes the full 'dspfarm profile' 'sccp ccm group' 'sccp' and configuration under 'telephony service' including 'conference hardware'.

Otherwise the software CME conferencing will not create the DTMF tones.



brandon_leiker Mon, 03/09/2009 - 09:55
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Would it be possible that you could provide me with the commands (steps) needed to implement the hardware conferencing? Thanks in advance


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