Session Initiation ProtocolCorrect and efficient communication is the necessity of the hour the place most companies rely on the telephony communication system. It’s mandatory for organizations to remain in contact with clients all around the world for a enterprise to flourish and enhance productiveness. And VOIP trunk is one of the latest innovations that has created fairly a buzz in the telecommunication world.

This function-functionality indicator g.3gpp.ps2cs-srvcc-orig-pre-alerting when used in a Characteristic-Caps header subject of a SIP request or a SIP response signifies that: 1. the functional entity including the characteristic-capability indicator within the SIP message helps the PS to CS SRVCC for originating calls in pre-alerting part; and a couple of. all entities of which the purposeful entity including the function-functionality indicator within the SIP message is conscious of being requested to assist the characteristic do support the PS to CS SRVCC for originating calls in pre-alerting phase.

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