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N-Way Calling
With N-way calling, multiple contacts are associated with the same Address of Record (AoR). A conference server returns back its identity in the user part of the Contact header in the 200 response for an INVITE request. It also includes focus parameter in the Contact header to indicate that it is a conference focus. When transparency is enabled for contact header then ‘infocus’ is passed transparently to the other side.
Example CLI command to enable N-way calling:
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set global signaling sipSigControls multipleContactsPerAoR enabled |
Instance-id
SIP-B uses Instance-id to identify a particular registering device. A "sip.instance" feature tag is used in the Contact header of SIP requests and responses. Each device is expected to provide a globally unique instance-id. The
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P-Asserted-Identity
SIP-B uses P-Asserted-Identity to send called party identity. P-Asserted-Identity is allowed for certain request types. The
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Out-of-Dialog-REFER
If “relayNonInviteRequest” flag is enabled, Out-of-Dialog requests like REFER and SUBSCRIBE/NOTIFY are relayed using a route look-up to the ERE based on the request URI.
Example CLI command to enable relayNonInviteRequest flag:
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set addressContext default zone defaultSigZone sipTrunkGroup DALSG signaling relayNonInviteRequest enabled |
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Overview
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