Method for determining termination of an emergency service call

A method for determining whether a previously in-progress emergency service call is extant;

• said previously in-progress emergency service call being connected with an emergency service answering entity in an emergency service network employing a locating unit for ascertaining a geographic origin for said previously in-progress emergency service call;
• the method comprising:
• (a) monitoring a plurality of subsequent query signals at said locating unit from said emergency service answering entity;
• said subsequent query signals arriving at said locating unit after said locating unit receives a first signal establishing to said locating unit existence of said in-progress emergency service call;
• each said subsequent query signal soliciting a responsive signal from said locating unit relating to said geographic origin;
• (b) if a respective said subsequent query signal is received by said locating unit, within a first predetermined time interval, considering that said previously in-progress emergency service call is extant;
• and
• (c) if no respective said subsequent query signal is received by said locating unit, within a second predetermined time interval, considering that said previously in-progress emergency service call is not extant.

A method for determining whether a routing expression associated with a respective emergency service call should be disassociated with said respective emergency service call;

• said respective emergency service call being connected with an emergency service answering entity in an emergency service network employing a locating unit for ascertaining a geographic origin for said respective emergency service call;
• the method comprising:
• (a) receiving a first signal from said emergency service network at said locating unit establishing to said locating unit existence of said emergency service call;
• (b) monitoring arrival of subsequent query signals relating to said geographic location arriving at said locating unit from said emergency service answering entity after receiving said first signal;
• each said subsequent query signal soliciting a responsive signal from said locating unit relating to said geographic origin;
• (c) if a respective said subsequent query signal is received by said locating unit, within a first predetermined time interval, considering that said routing expression associated with said respective emergency service call should not be disassociated with said respective emergency service call;
• and
• (d) if no said subsequent query signal is received by said locating unit, within a second predetermined time interval, considering that said routing expression associated with said respective emergency service call should be disassociated with said respective emergency service call.