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

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209
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 VoIP voice entity view.
entity entity-number voip N/A
5. Enable DO-EO conversion.
early-offer forced
Optional.
By default, DO-EO
conversion is disabled.
NOTE:
If codec transparent transfer or media flow-around is enabled, the early-offer forced command does no
t
takes effect.
Enabling codec transcoding
In the scenario where the SIP trunk device controls the results of media capability negotiation, if the SIP
trunk device cannot find a common codec for two parties during negotiation, the two parties will fail to
establish a call. In this case, enable codec transcoding on the SIP trunk device.
With this function enabled, the SIP trunk device uses its own codec capability set to negotiate with the
calling and called parties respectively. If the negotiated codecs with the two parties do not match, the SIP
trunk device transcodes the media flows passing through it.
The codec transcoding feature does not take effect in any of the following cases:
• Codec transcoding is enabled, but no DSP resources are available for codec transcoding.
• Codec transparent transfer is enabled.
• Media flow-around is enabled.
To enable codec transcoding:
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 VoIP voice entity view.
entity entity-number voip N/A
5. Enable codec transcoding.
codec transcoding
Optional.
By default, codec
transcoding is disabled.
Enabling address hiding
If the SIP trunk device acts as the session border gateway, the addresses of the endpoints are always
hidden to the peers. The SIP trunk device replaces the endpoints' addresses carried in SIP messages with
the addresses of the corresponding egress interfaces. For both the calling and called parties, the SIP
trunk device is the only ingress of signaling and media packets.