[SIPForum-discussion] CENTREX Solution with SIP

[Ali Kemal MAYUK]

Hi all;

I am investigating about how Centrex work with SIP. If an enterprise
customer has a 2 different locations, how they call each other with short
numbers(4 digit) ? Which SIP headers are used for it? Is there a
standartization ? Does any one have a solution documentation? How the big
companies handle it?

-- 
Kemal
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