SIP
Session timer
Switches on the check after a connection for a call that is still in existence.
Note: When the SIP session timer is switched on, this may result in the call being interrupted more frequently after the specified interval, if a VoIP provider has not implemented session renewal properly. In this case, set a different session timeout or disabled the session timer.
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SIP Session timeout (in min.)
2 … 255 minutes, default: 15 minutes
Specifies the number of minutes after which the SIP session timer is to check a call's connection.
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SIP Protocol type
UDP
(the User Datagram Protocol) is used to send data packets over connectionless non-secure communication lines.
TCP
(Transmission Control Protocol) segments data into packets from a specified size and sends these individual data packets to the recipient address until receipt has been confirmed.
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SIP Important: If encryption is enabled by SIPS, the TCP transport protocol is used. Manual settings are overwritten.
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SIP Local SIP port
0 … 65535
Sets the outgoing port for SIP messages.
Note: Enter "0" to generate a random port.
Important: If you define more than one identity, the SIP port for each identity must be different. If you enter "0", different ports are assigned automatically.
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SIP Subscription interval (min)
This sets the frequency at which the status of potential changes are queried on the PBX. Default: 45 minutes.
The value you enter here should be a compromise between a short interval (which generates traffic) and rapid updates.
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SIP