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Scalable voip mobility intedration and deployment- P32: The term voice mobility can mean a number of different things to different people. Two words that can be quite trendy by themselves, but stuck together as if forgotten at a bus station long past the last ride of the night, the phrase rings a number of different, and at times discordant, bells. | 310 Chapter 7 Public Switched Telephony Network PSTN Owns Number 408 987-6543 Telephone Lines PBX Base Station Access Point Carrier Network Enterprise Network Phone Figure 7.5 An In-Building Call with Enterprise-Centric FMC Media Gateway Gateway Switch Base Station Controller Owns Number 408 555-1111 3 Incoming call is routed to Wi-Fi radio phone. FMC Dialing Software runs the SIP engine and handles the call. Wi-Fi Radio Assigned Extension 1111 Cellular Radio Assigned Number 408 987-6543 Extensions tl o mu mu mu mu FMC Mobiity Appliance 1 Phone registers using SIP to PBX FMC Dialing Software Landline 2 Incoming call is routed 650 222-2222 to PBX mu mu Hill mu mu www.newnespress.com Voice over Cellular and Licensed Spectrum 311 Figure 7.6 An Out-of-Building Call with Enterprise-Centric FMC Wi-Fi Radio Assigned Extension 1111 Cellular Radio Assigned Number 408 987-6543 www.newnespress.com 312 Chapter 7 The phone call reaches the mobile phone. Instead of the normal mobile phone application and display showing an incoming call however the FMC dialing software takes over and shows its own display. This display provides the correct information about the call if the normal phone application had shown the incoming call as is it would have shown the phone number the mobility appliance used to place the outgoing call or possibly some other incorrect enterprise number. Outgoing calls from the cellphone are performed similarly. When the phone is in the Wi-Fi network the call works as usual. However when the phone is in the carrier s network the FMC dialing software must route the call back to the enterprise where the mobility appliance will then bridges the call back to the final destination. This extra step is necessary to ensure that the caller ID is correct. Notice the similarity of the concept used behind the roaming mechanism to the one the mobile carriers used when setting up their service on top of the public landline telephone network. The enterprise-centric FMC .
