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.
Further help under SIPSession 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.
Further help under SIPProtocol 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.
Further help under SIP
Important: If encryption is enabled by SIPS, the TCP transport protocol is used. Manual settings are overwritten. Further help under SIPLocal 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. Further help under SIPSubscription 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.
Further help under SIP