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2. List of SIP response codes - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_response_codes

   An intermediary machine or process rejected the call attempt. [25] This contrasts with the 607 (Unwanted) SIP response code in which a human, the called party, rejected the call. The intermediary rejecting the call should include a Call-Info header with "purpose" value "jwscard", with the jCard [26] with contact details. The calling party can ...

3. Session Initiation Protocol - Wikipedia

   en.wikipedia.org/wiki/Session_Initiation_Protocol

   A proxy interprets, and, if necessary, rewrites specific parts of a request message before forwarding it. SIP proxy servers that route messages to more than one destination are called forking proxies. The forking of a SIP request establishes multiple dialogs from the single request. Thus, a call may be answered from one of multiple SIP endpoints.

4. ISDN User Part - Wikipedia

   en.wikipedia.org/wiki/ISDN_User_Part

   To allow a call to be set up correctly, where ISUP is supported, a switch will signal call-related information like called party number to the next switch in the network using ISUP messages. The telephone exchanges may be connected via T1 or E1 trunks which transport the speech from the calls. These trunks are divided into 64 kbit/s timeslots ...

5. Session border controller - Wikipedia

   en.wikipedia.org/wiki/Session_border_controller

   To show the operation of an SBC, one can compare a simple call establishment sequence with a call establishment sequence with an SBC. [4] In the simplest session establishment sequence with only one proxy between the user agents the proxy’s task is to identify the callee’s location and forward the request to it.

6. Back-to-back user agent - Wikipedia

   en.wikipedia.org/wiki/Back-to-back_user_agent

   As all control messages for each call flow through the B2BUA, a service provider may implement value-added features available during the call. In the originating call leg, the B2BUA acts as a user agent server (UAS) and processes the request as a user agent client (UAC) to the destination end, handling the signaling between end points back-to-back.

7. SIP URI scheme - Wikipedia

   en.wikipedia.org/wiki/SIP_URI_scheme

   The gateway may require the user REGISTER using SIP before placing this call. If a destination port is provided as part of the SIP URI, the NAPTR/SRV lookups are not used; rather, the client directly connects to the specified host and port. As a SIP address is text, much like an e-mail address, it may contain non-numeric characters.