... Pattern5 -11 Outbound Calls Through the PSTN5 -12 Chapter 1 IntroductionGeneral Design Models 1- 2 Cisco IP Telephony Network Design Guide 78 -11 103 -03 Figure 1- 1 Composite ModelLarge campus(Up to 10 ,00 0 ... Telephony Network Design Guide 78 -11 103 -03 Figure 1- 3 Multiple Independent SitesVIPIPIPVIPIPIPVIPIPIPVIPIPIPPSTN 407 65 2-9 Cisco IP Telephony Network Design Guide 78 -11 103 -03 Chapter ... calling Cisco corporate headquarters (California, USA) at 408 526-7 208 or, in North America, by calling 800 553-NETS(6387). xvii Cisco IP Telephony Network Design Guide 78 -11 103 -03 PrefaceAdditional...