CounterPath Bria 4 Administrator Guide - Manual (Page 49)

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4.5 Preferences – Calls
Field Description
Auto Answer Let your users set these fields to suit.
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 RFC 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.
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.
Preserve Bandwidth When this feature is on, Bria stops sending audio when you are not talking.
When this feature is off, Bria always sends audio, which uses more bandwidth but may result in
better call quality.
Typically off. However, if you are using a slow (dial-up or ISDN) connection, you may want to
turn it on.