Emergency call email subject

This is the subject of the email that is sent when an emergency call is made. Available variables are:

• <TMPL_VAR NAME=SDESCRIPTION> If the call source is a telephone line this contains the telephone's description
• <TMPL_VAR NAME=TALKTIME> Duration of the call in seconds
• <TMPL_VAR NAME=XXX> Name of any column xxx from table 'customers', referring to the customer who made the emergency call
• <TMPL_VAR NAME=YYY> Name of any column yyy from table 'plans', referring to the rate plan of the call
• <TMPL_VAR NAME=ZZZ> Name of any column zzz from table 'active', referring to the active emergency call