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The SIP Advanced Settings object is a extension of the SIP Profile object. The SIP Advanced Settings object adds attributes/features to the already created SIP Profile.
Field Descriptions
Outbound Modem Triggers Re-INVITE
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The ITX/TXA messages are used in a Spirou (Signalisation Pour l'Interconnexion des Réseaux Ouverts/Signaling for the Interconnection of Open Networks) network for audio services that are paid for by either a flat rate calculation or time based calculation. The IMG 2020 supports sending both the ITX and TXA messages. The INFO for Spirou/ITX field enables or disables the sending of these messages. Refer to SPIROU/ITX in SIP INFO topic for more information.
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Signaling Only - The Fully Qualified Domain Name assigned to the local SIP Signaling port in the SIP Signaling object is inserted in the outgoing SIP messages. See SIP FQDN Support topic.
SDP c=line Only - The Fully Qualified Domain Name assigned in the VoIP Resource object is inserted in the outgoing SIP messages and responses.
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For more information refer to SIP Reason Header.
Allow 180 after 183
In a normal call flow the 183 Session Progress message indicates whether the calling user agent should provide alerting or not. Once the 183 has been sent then a 180 Ringing message is sent dependent on the specific call flow. The Allow 180 after 183 field can be configured either to allow or suppress the 180 Ringing message. See below.
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SIP provides a secure URI called SIPS URI. If an external gateway and the IMG 2020 are configured to use TLS security, then this field is used to select the URI scheme sips or sip. If TLS is not configured on the IMG 2020 then the Enable SIPS field will be ignored. Refer to the Configure TLS topic for information on configuring TLS functionality. If TLS is configured on IMG 2020 then the selections below are valid. See example below.
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The IMG 2020 supports sending and receiving the Retry Header in the event there is SIP congestion. When the Retry after support field is set to enable, the IMG 2020 would determine the level of SIP congestion. If it is determined that SIP congestion levels are acceptable, the call will go through. If however congestion levels are high, the IMG 2020 will send a 503 Service Unavailable along with a Retry Header indicating time to wait before re-sending INVITE back to IMG 2020. Refer to SIP Retry-After Header - Transmit and SIP Retry-After Header - Receive for more information.
Enabled (Default) - The IMG 2020 will respond with a Retry-After Header in its response if the Channel Group is congested.
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Disabled (Default) - Clear Channel Override is disabled. The Outgoing Codec will not be forced to Clear Channel even if the incoming parameters dictate the correct conditions. See Clear Channel Codec Support for more information.
Enabled - If the Bearer Capability value of the incoming call matches a certain set of requirements and the Clear Channel Override field in the SIP SGP Profile pane on the outgoing side is set to enable then the IMG 2020 will force the outgoing Codec to be clear channel. See Clear Channel Codec for more information.
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The Phone-Context Parameter (RFC 3966) is supported on the IMG 2020 for outgoing INVITE requests only. Select from drop down menu one of the following choices. See SIP Phone Context Parameter for more information.
Disabled (Default) - Phone Context support is by default disabled.
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Allow - Allow the IMG 2020 to accept a NOTIFY message without a Subscription. The Notify message will be accepted without a subscription only if the parameters Content Type = application/simple-message-summary and Event = message summary are in the SIP NOTIFY message. Select Allow when configuring the Message Waiting Indicator feature.
183 Periodic Retransmission
In response to a SIP INVITE message, a 183 Session Progress message is first received on the B Leg. It is interworked and transmitted out the A leg. If the Call Answer Timeout value in the field below is set to a large amount of time, the IMG 2020 will keep retransmitting the interworked 183 Session Progress messages. Typically one 183 Session Progress message every minute. The 183 Periodic Transmission field can either enable or disable the retransmission of these 183 Session Progress messages out the A Leg. Refer to the Call Answer Timeout and 183 Periodic Retransmission functionality topic for more information.
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After a 183 Call Session Progress message is received, a Call Answer Timeout timer starts. If this timer expires, the call is cancelled. During a SIP Early Media call, the Call Answer Timeout may need to be extended to accept the early media. The Call Answer Timeout field allows a user the ability to modify the Timeout period. The default value is 3 minutes and can be modified to not expire for up to 60 minutes. For more information on the functionality of the Call Answer Timeout field, refer to the Call Answer Timeout and 183 Periodic Retransmission functionality topic.
T38UDPFEC in SDP Response
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CIC (Carrier Identification Code)and DAI (Dial Around Indicator) - The CIC parameter is a three or four digit code used in routing tables to identify the network that serves the remote user when a call is routed over many different networks. The DAI parameter will be displayed immediately after the CIC code. See SIP CIC and DAI Codes for more information.
RN (Routing Number) - The RN tag is used to convey the location routing number. Refer to the Local Number Portability (LNP) topic for more information.
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ISUB/ISUB-Encoding - The ISDN calling party Subaddress parameters convey address information of each device in the ISDN network. For more information on ISUB Encoding, refer to the ISUB Encoding topic.
tty-ind - custom parameter indicating Baudot tone detection in Re-INVITE
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