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How the negotiation happens between both ends to make a call ?

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When we pick the phone and dial the number. ??

posted Nov 23, 2013 by anonymous

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Which protocol ???

1 Answer

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If question is regarding SIP/VoIP .. then negotiation between both the ends is based on offer-answer model defined in the SIP.
let's say A party know 3 languages ( English, Hindi, Kannada) and B party knows only English, but in SDP sent from A to B will have all the capabilities included but in Answer for this SDP contains only supported languages, it means B party is agreed only to speak in English.

Note: I just given example of languages for understanding purpose, in SDP we will send codecs i.e. voice/video..etc ..

answer Apr 28, 2016 by Bhushan Patil
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