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

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Configuration procedure
To configure periodic refresh of SIP sessions:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter voice view.
voice-setup N/A
3. Enter SIP client view.
sip N/A
4. Enable periodic refresh of SIP
sessions and set the maximum
and minimum session
expiration time.
timer session-expires seconds
[ minimum min-seconds ]
Optional.
By default,.
• The periodic refresh of SIP
sessions is not enabled
automatically. That is, if
periodic refresh of SIP sessions
is disabled on the called party
but enabled on the calling
party, the called party will
enable periodic refresh of SIP
sessions after negotiation.
• The minimum session duration
is 90 seconds.
Enabling early media negotiation
With early media negotiation enabled, if the device is the called party, it sends a 183 session progress
response with media information to the calling party to perform early media negotiation and
automatically plays tones to the calling party. The called party can play only common ring back tones to
the calling party. However, in some actual applications, such as the caller ring back tone (CRBT) service,
servers are required to play the ring back tones to the calling party. Therefore, you need to disable early
media negotiation on the called party for those applications. After that, the called party sends a 180
ringing response without media information to the calling party, and the calling party receives only
CRBTs played by the server instead of the common ring back tones played by the called party.
To enable early media negotiation:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter voice view.
voice-setup N/A
3. Enter SIP client view.
sip N/A
4. Enable early media
negotiation on the device.
early-media enable
Optional.
Enabled by default. In other words,
when the device is the called party,
it sends a 183 session progress
response with media information to
the called party.