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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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.
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SIPProtocol type
UDP
(User Datagram Protocol). Used to send data packets over connectionless non-secure communication lines.
Note: If very large data packets are present, TCP is used instead of UDP. The maximum size of a data packet can vary according to the network. (RFC 3261 > TCP)
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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SIPImportant: If encryption using SIPS is enabled, the TCP transport protocol is used. Manual settings are overwritten.
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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.
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SIPRetry subscriptions
Type of repetition
Sets the interval at which attempts are made to configure a subscription on the PBX/provider, if an error occurs.
•Never
The device sends exactly one subscription to the PBX/provider. No other subscriptions are sent.
•Fixed interval
Attempts to subscribe on the PBX/provider are made at the specified interval.
•Redouble interval
The set number of seconds doubles after each attempt to subscribe on the PBX/provider.
Interval in seconds
Sets the time gap between two subscription attempts.
Minimum: 10 sec
Default: 180 sec
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SIPRetry register
Type of repetition
Sets the interval at which attempts are made to register on the PBX/provider, if an error occurs.
•Never
The device makes exactly one attempt to register on the PBX/provider. There are no more registration attempts.
•Fixed interval
Attempts to register on the PBX/provider are made at the specified interval.
•Redouble interval
The set number of seconds doubles after each attempt to register on the PBX/provider.
Interval in seconds
Sets the time gap between two subscription attempts.
Minimum: 1 sec
Default: 10 sec
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SIP