When this check box is checked, all media channels must terminate and reoriginate on the MTP device. Check this check box to provide media channel information in the outgoing INVITE request. You can configure Cisco Unified Communications Manager SIP trunks to always use an MTP. OOB and RFC 2833-Choose this configuration if both out of band and RFC2833 should be used for DTMF. Out of band provides the fallback method if the peer endpoint supports it. RFC 2833-Choose this configuration if the preferred DTMF method to be used across the trunk is RFC2833. Cisco Unified Communications Manager makes every effort to negotiate RFC2833, regardless of MTP usage. If Cisco Unified Communications Manager has no choice but to allocate an MTP (if the Media Termination Point Required check box is checked), SIP trunk will negotiate DTMF to RFC2833. 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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