CounterPath Bria 3.0 Administrator Guide - Manual (Page 48)

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DTMF Choose the method for sending DTMF that is supported by your VoIP service
provider.
In-band means that Bria will encode the DTMF signals in the audio stream as
regular sound. Typically, DTMF is not sent in-band; in-band is only used in
specific situations.
One scenario in which it might be advisable to send in-band is if you own your
gateways and:
• One or more of these gateways does not support 2833 or does not handle it
well, and
• Your gateway is using codes that reproduce DTMF tones well.
In this case, sending in-band will ensure that DTMF tones get through (because
the DTMF tones will bypass the gateway) and that they reproduce accurately at
the receiving end.
Another scenario is:
• One or more of these gateways does not support 2833 or does not handle it
well.
• Your gateway is using codecs that do not reproduce DTMF tones well
(because they are designed to handle human voice rather than artificial
sounds).
In this scenario, using in-band will not help ensure DTMF ones get through.
There is in fact no solution in this scenario.
RTP The RTP inactivity timers control how phone calls are disconnected when RTP
and/or RTCP are not detected. You can choose to enable or disable the timers.
The timers are enabled by default.
If you leave the timers enabled, you can set the value of the RTCP timer. The
RTP timer is fixed at 30 seconds.
• Bria ends a call if it has never detected RTCP in the call and no RTP is
received for the length of the RTP timer (30 seconds).
• Bria ends a call if it has detected RTCP on this call but then it does not receive
an RTCP for the length of the RTCP timer (default value: 300 seconds). You
can change the length of this timer.
Use old style hold
Choose the appropriate value:
• Unchecked: Indicate the hold request in the SDP m-line (as per the latest
standard)
• Checked: Indicate the hold request in the SDP m-line and in the SDP c-line.
Table 11: Preferences – Advanced
Field Description