Cisco IE-3000-8TC Administration Guide - Page 306

Connection Settings Setting DTMF Signaling Method SIP Rel1xx Options Description Choose from the following options: • No Preference (default)-Cisco Business Edition 3000 will pick the DTMF method to negotiate DTMF, so the call does not require an MTP. If Cisco Business Edition 3000 has no option but to allocate an MTP (if the Media Termination Point Required check box is checked), SIP trunk will negotiate DTMF to RFC 2833. • RFC 2833-Choose this configuration if the preferred DTMF method to be used across the trunk is RFC 2833. Cisco Business Edition 3000 makes every effort to negotiate RFC 2833, regardless of a media termination point (MTP) usage. Out-of-band provides the fallback method if the peer endpoint supports it. • OOB and RFC 2833-Choose this configuration if both out of band and RFC 2833 should be used for DTMF. Note If the peer endpoint supports both out of band and RFC 2833, Cisco Business Edition 3000 will negotiate both out-of-band and RFC 2833 DTMF methods. As a result, two DTMF events would get sent for the same DTMF keypress (one out of band and the other RFC 2833). This field configures SIP Rel1xx, which determines whether all SIP provisional responses (other than 100 Trying messages) get sent reliably to the remote SIP endpoint. Valid values follow: • Disabled-Disables SIP Rel1xx. • Send PRACK if 1xx contains SDP-Acknowledges a 1xx message with PRACK, only if the 1xx message contains SDP. • Send PRACK for all 1xx messages-Acknowledges all1xx messages with PRACK. Presentation and Identification Information Administration Guide for Cisco Business Edition 3000, Release 8.6(4) 286 OL-27022-01