SIP services
Beyond making and receiving calls, you can implement a series of SIP services. These services include, but are not limited to, Call Transfers, Call Pickup, Call Hold, Call Forward, and many others. Fortunately, RFC 5359 (SIP services) defines a standard way to accomplish these tasks. Most SIP phones comply with the way SIP services are implemented; however, to make them work, you need to make sure that all the components in the network support some specific RFCs. As an example, the call transfer requires the support of the REFER method defined in RFC 3515 and the Referred-By and Replaces headers defined in RFCs 3891 and 3892, respectively. If you intend to provide PBX-like services using a SIP proxy, you have to make sure that all ...
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