No Preference (default)-Cisco Unified Communications Manager will pick the DTMF method to negotiate DTMF, so the call does not require an MTP. Here are the CUCM Trunk configuration parameter that can be selected:ĭTMF Signaling Method: Choose from the following options: In Out-of-Band, DTMF information is carried outside the voice traffic.
In In-Band, the DTMF information is carried inside the actual voice traffic. Here are some of the ways DTMF is used in SIP environments. What I have seen is mostly DTMF causes most pain for the engineers. Even though SIP is quickly becoming the industry standard (if not already), there are issues with SIP which because the way each vendor implements it in their products.
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