/,Description,Reference service,Specific telephony service used in this call,[RFC7462] service:normal,Normal ring/ringback rendering (default value),[RFC7462] service:call-waiting,Call waiting was initiated at the other side of the call,[RFC7462] service:forward,Call has been forwarded,[RFC7462] service:recall:callback,Recall due to callback,[RFC7462] service:recall:hold,Recall due to call hold,[RFC7462] service:recall:transfer,Recall due to transfer,[RFC7462] source,Classification of the other party to the call,[RFC7462] source:unclassified,Unclassified ring/ringback rendering (default value),[RFC7462] source:internal,User at the other side of the call is internal to the enterprise or PBX system,[RFC7462] source:external,User at the other side of the call is external to the enterprise or PBX system,[RFC7462] source:friend,User at the other side of the call is a friend,[RFC7462] source:family,User at the other side of the call is a family member,[RFC7462] priority,Priority of the call,[RFC7462] priority:normal,Normal ring/ringback rendering (default value),[RFC7462] priority:low,Low priority call,[RFC7462] priority:high,High priority call,[RFC7462] duration,Duration of alerting signal,[RFC7462] duration:normal,Normal ring/ringback rendering (default value),[RFC7462] duration:short,Shorter than normal,[RFC7462] duration:long,Longer than normal,[RFC7462] delay,Delay of rendering of alerting signal,[RFC7462] delay:none,Immediate alerting (default value),[RFC7462] delay:yes,Delayed alerting,[RFC7462] locale,Location-specific alerting signals,[RFC7462] locale:default,Alerting not location-specific (default value),[RFC7462] locale:country:,Alerting according to the conventions of the specified country,[RFC7462] service:crs,Customized Ringing Signal (CRS),[3GPP TS 24.183][Lionel_Morand]