CHECKSIPDOMAIN(domain)
Description
This function checks if the domain in the argument is configured as a local SIPSession Initiation Protocol, the standard signaling protocol used to set up, manage, and tear down VoIP calls between Asterisk and phones or carriers. domain that this Asterisk server is configured to handle. Returns the domain name if it is locally handled, otherwise an empty string. Check the 'domain=' configuration in sip.conf.
Arguments
domain
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