p link Main link Enterprise campus Figure 5-9 A direct connection to multiple cloud providers from corporate hub sites. www.TechnicalPDF.com Session Initiation Protocol-Out-of-Band Signaling SIP signaling is used for connections between telephone companies in: IP networks Telephones connected to internal telephone systems Trunks that carry traffic into enterprise locations. Using SIP Trunks for Caller Identification in Call Centers Session Initiation Protocol (SIP) signaling is an IETF (Internet Engineering Task Force). It is used in broadband networks for connections between carriers and in on-premises telephone systems. Because SIP trunks carry signaling bits including those with the calling party's names and telephone numbers, most call centers' incoming calls are carried on SIP trunks. The telephone system captures the caller information and sends it to display-equipped telephones. Figure 5-10 illustrates a SIP trunk for transporting caller ID. Employees who receive heavy volumes of calls from vendors or who prefer to only take calls from certain callers use caller information on SIP trunks to screen calls. Unanswered calls are automatically forwarded into voice mail. Voice network www.TechnicalPDF.com AT&TorVerizon number are routed to agent. building Internet Session Initiation Protocol Figure 5-10 SIP trunks used in an organization to identify callers' names and phone numbers. (Stock photo by Chun-Tso Lin/123RF) Large call centers that use SIP trunks have an additional benefit-the caller ID data can be treated differently than the call itself. This is significant because www.TechnicalPDF.com it enables the telephone system to access information differently from the call. It can send the telephone number to a database that matches the telephone number to the customer account number. The data network sends the account number to the agent's terminal to which the call is sent, which saves agents time by eliminating the need to key in account numbers. Wide Area Software Defined Networks for Enterprises In earli