Cisco CP-7911G-CH1 Administration Guide - Page 17

Cisco Unified SCCP and SIP SRST Feature Overview Cisco Unified SCCP SRST Restrictions for Configuring Cisco Unified SCCP SRST Table 1 Table 1 provides a history of restrictions from Cisco SCCP SRST Version 1.0 to the present version of Cisco Unified SCCP SRST. Restrictions from Cisco SCCP SRST from the Present Version to Version 1.0 Cisco Unified SRST Cisco IOS Version Release Version 4.1 12.4.(15)T Restrictions • Enhanced 911 Services for Cisco Unified SRST does not interface with the Cisco Emergency Responder. • The information about the most recent phone that called 911 is not preserved after a reboot of Cisco Unified SRST. • Cisco Emergency Responder does not have access to any updates made to the emergency call history table when remote IP phones are in Cisco Unified SRST fallback mode. Therefore, if the PSAP calls back after the Cisco Unified IP phones register back to Cisco Unified Communications Manager, Cisco Emergency Responder will not have any history of those calls. As a result, those calls will not get routed to the original 911 caller. Instead, the calls are routed to the default destination that is configured on Cisco Emergency Responder for the corresponding ELIN. • For Cisco Unified Wireless IP Phone 7920 and 7921, a caller's location can only be determined by the static information configured by the system administrator. For more information, see the Precautions for Mobile Phones in Configuring Enhanced 911 Services. • The extension numbers of 911 callers can be translated to only two emergency location identification numbers (ELINs) for each emergency response location (ERL). • Using ELINs for multiple purposes can result in unexpected interactions with existing Cisco Unified SRST features. These multiple uses of an ELIN can include configuring an ELIN for use as an actual phone number (ephone-dn, voice register dn, or FXS destination-pattern), a Call Pickup number, or an alias rerouting number. For more information, see the Multiple Usages of an ELIN in Configuring Enhanced 911 Services. • There are a number of other ways that your configuration of Enhanced 911 Services can interact with existing Cisco Unified SRST features and cause unexpected behavior. For a complete description of interactions between Enhanced 911 Services and existing Cisco Unified SRST features, see the "Interactions with Existing Cisco Unified SIP SRST Features" section on page 106. OL-13143-04 Cisco Unified SCCP and SIP SRST System Administrator Guide 17