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
(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.
Further help under SIP
Important: If encryption using SIPS is enabled, the TCP transport protocol is used. Manual settings are overwritten.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 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
Further help under 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
Further help under SIPDTMF method
Specifies the DTMF method used to transmit signals.
•RTP event
Transmission of event packets in the RTP stream
•Inband
Transmission of coded sound signals, directly in the RTP stream
•SIP info
Transmission of SIP info messages
Further help under DTMF