Cisco Catalyst 3000, Administration Manual

Page: 306 / 496

Description Setting
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.
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). Note
DTMF Signaling Method
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.
SIP Rel1xx Options
Presentation and Identification Information
Administration Guide for Cisco Business Edition 3000, Release 8.6(4)
286 OL-27022-01
Connection Settings