R2511-HP MSR Router Series Voice Configuration Guide(V5)

153
Ste
p
Command Remarks
5. Specify the URL scheme for
outgoing SIP calls.
url { sip | sips }
Optional.
By default, no URL scheme is
configured.
This command is effective only
when the type of the VoIP voice
entity is SIP.
You can specify the SIPS scheme
only when the transport layer
protocol is TLS.
Configuring SIP extensions
Strict SIP routing
Strict SIP routing is supported. In a complicated network environment where a request from SIP UAC to
SIP UAS needs to pass through multiple proxy servers, SIP uses the Route header field and the
Record-Route header field to make sure that requests in the dialog can be routed through these proxy
servers. The strict SIP routing is enabled by default, and you do not need to configure it.
Configuring out-of-band SIP DTMF transmission mode
During the communication between caller and callee, the DTMF digits can be transmitted transparently
between them in two ways: in-band and out-of-band. In the in-band approach, the DTMF digits are
encoded in RTP voice packets, and in the out-of-band approach, in SIP messages.
Configuration prerequisites
If a SIP server is used to forward calls, complete the configurations on the SIP server. To implement
bidirectional DTMF out-of-band transmission, configure it in the VoIP entity on the calling UA and in the
corresponding POTS voice entity on the called UA. For specific configurations, see "Configuring
out
-of-band SIP DTMF transmission mode."
Configuration procedure
To configure the out-of-band SIP DTMF transmission mode:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter voice view.
voice-setup N/A
3. Enter voice dial program
view.
dial-program N/A
4. Enter voice entity view.
entity entity-number { pots | voip }
N/A
5. Configure the out-of-band SIP
DTMF transmission mode.
outband sip
Inband DTMF transmission mode is
applied by default.