Called Party Hold (Bureau Hold) This feature gives the PSAP attendant control over disconnection of an emergency call; it means that once connected to the PSAP, an emergency caller remains attached until the PSAP attendant goes This ‘on-hook’. feature is not supported on current circuit switched wireless networks. Ringback This feature allows a PSAP attendant to attempt to re-establish communication with someone at the location of the caller. This feature is not supported on current circuit switched wireless networks. Switch Hook Status This feature provides the PSAP attendant with a distinctive tone to indicate that the emergency caller has gone This feature is ‘on-hook’. not supported on current circuit switched wireless networks. Baseline for T9-1-1 In consideration of a text-based access arrangement to the service, it is necessary to establish a baseline that includes all of the features and capabilities that are currently used in the legacy system, and then ultimately assess the appropriateness and feasibility for attainment of these features and capabilities in a text messaging system. Since the Basic service is less sophisticated than the Enhanced service, the baseline should be derived from the features and capabilities of Enhanced . Text is a Datagram Voice conversations over telecommunications systems are two-way full duplex and are session-based. A text message is a one-way datagram whose reverse path may not be readily known. Systems involved with any T9-1-1 service must facilitate the routing and sequencing of multiple messages sent from the same user to the same message taker and vice-versa. Most text messages are transported via Internet Protocol (IP). Datagrams that are transported by IP are subject to no guarantee of delivery, no proper sequencing, and no duplicate delivery. Latency and delay may occur and are usually the result of high messaging volume. For example, it has been observed that a peak number of SMS text messages are sent on Eve, as high as 4.6 text messages New Year’s per capita in 2007.
Called Party Hold (Bureau Hold) This feature gives the PSAP attendant control over disconnection of an emergency call; it means that once connected to the PSAP, an emergency caller remains attached until the PSAP attendant goes ‘on-hook’. This feature is not supported on current circuit switched wireless networks. Ringback This feature allows a PSAP attendant to attempt to re-establish communication with someone at the location of the caller. This feature is not supported on current circuit switched wireless networks. Switch Hook Status This feature provides the PSAP attendant with a distinctive tone to indicate that the emergency caller has gone ‘on-hook’. This feature is not supported on current circuit switched wireless networks. Baseline for T9-1-1 In consideration of a text-based access arrangement to the service, it is necessary to establish a baseline that includes all of the features and capabilities that are currently used in the legacy system, and then ultimately assess the appropriateness and feasibility for attainment of these features and capabilities in a text messaging system. Since the Basic service is less sophisticated than the Enhanced service, the baseline should be derived from the features and capabilities of Enhanced . Text is a Datagram Voice conversations over telecommunications systems are two-way full duplex and are session-based. A text message is a one-way datagram whose reverse path may not be readily known. Systems involved with any T9-1-1 service must facilitate the routing and sequencing of multiple messages sent from the same user to the same message taker and vice-versa. Most text messages are transported via Internet Protocol (IP). Datagrams that are transported by IP are subject to no guarantee of delivery, no proper sequencing, and no duplicate delivery. Latency and delay may occur and are usually the result of high messaging volume. For example, it has been observed that a peak number of SMS text messages are sent on New Year’s Eve, as high as 4.6 text messages per capita in 2007.
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