Figure 2 shows a survivable branch office deployment with CS 1000 Call Server located at the corporate main office or data center and Secure Router providing survivable SIP-PSTN gateway functionality complimenting the existing data infrastructure.
The SR 2330/4134 supports a variety of PSTN interfaces like T1/E1, BRI U, BRI S/T, FXS/DID and FXO/CAMA for connectivity to PSTN and legacy PBXs and telephony devices. Also supports a rich set of PSTN protocols including ISDN PRI, BRI, QSIG, T1 CAS, E1 R2 and analog signaling.
The Secure Router also includes a SIP Registrar and B2BUA based SIP Proxy which can function as a backup SIP Server supporting up-to 300 SIP end-points including Nortel and 3rd-party SIP phones Nortel 1120E/1140E, Nortel 1535 Video phone, LG Nortel 6800/8800, Polycom 330, SMC 3456, IP Dialog and Xlite. It can provide phone and call routing services to the branch office when main office call server connectivity is lost and is already tested with Nortel Call Servers and 3rd party Servers - CS 1000, CS 2100, CS 2000, A2E, SCS,
