CounterPath Bria 3.5.2 for Windows User Guide - Retail Deployments - Manual (Page 84)

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Preferences – Calls
Table 12: Preferences – Calls
Field Description
Calls These settings let you configure how you want auto answer to handle incoming calls,
when Auto Answer is enabled. (To enable Auto Answer, see page 15)
DTMF You may need to change the DTMF configuration if you cannot interact with interactive
voice response systems (auto attendants, voice-activated menus, and so on).
Contact your VoIP service provider for the correct setting.
RTP This timer controls how calls are disconnected when Bria determines that there is a
problem with the call and the other party has probably disappeared (assuming that you
have not yourself detected the problem and hung up manually).
Typically, the timer is enabled. It is recommended that you not disable it.
You can change the length of the timer, but do not set it to less than 30 seconds.
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.