R2511-HP MSR Router Series Voice Command Reference(V5)

193
• transport
media-protocol
Use media-protocol to specify the media flow protocols for SIP calls.
Use undo media-protocol to restore the default.
Syntax
media-protocol { rtp | srtp } *
undo media-protocol
Default
SIP calls use RTP as the media flow protocol.
Views
SIP client view
Default command level
2: System level
Parameters
rtp: Specifies the Real-time Transport Protocol (RTP) as the media flow protocol for SIP calls.
srtp: Specifies the Secure Real-Time Transport Protocol (SRTP) as the media flow protocol for SIP calls.
Usage guidelines
When both the RTP and SRTP protocols are specified as the media flow protocols for SIP calls:
• If the device is the call initiator, both media flow protocols are carried in the INVITE message for the
receiver to select.
• If the device is the call receiver, the SRTP protocol is first used for media flow negotiation. If the
negotiation fails, the RTP protocol is used.
Examples
# Specify SRTP as the media flow protocol for SIP calls.
<Sysname> system-view
[Sysname] voice-setup
[Sysname-voice] sip
[Sysname-voice-sip] media-protocol srtp
outband sip
Use outband sip to configure the out-of-band SIP DTMF transmission mode.
Use undo outband sip to restore the default DTMF transmission mode.
Syntax
outband sip
undo outband
Default
The inband DTMF transmission mode is adopted.