[Users] NEW FEATURE: new pseudo-variables from dialog module

Hi everybody, the dialog module exports 2 new pseudo variables: *DLG_lifetime* - the duration (in seconds) of the dialog. The duration is calculated from the dialog confirmation and the current moment. This PV will be available only for sequential requests, after doing loose_route(). So, it can be used to get timestamps foe sequential requests, or to get the overall dialog duration and to use it for accounting. Closes Feature Request 1611930. https://sourceforge.net/tracker/index.php?func=detail&aid=1611930&g… *DLG_status* - Returns the status of the dialog. This PV will be available only for sequential requests, after doing loose_route(). Value may be: 3 - Confirmed by a final reply but no ACK received yet. 4 - Confirmed by a final reply and ACK received. 5 - Dialog ended. Can be used to delay re-INVITEs until ACK is received and avoid signalling races. Closes Feature Request 1610630. https://sourceforge.net/tracker/index.php?func=detail&aid=1610630&g… regards, bogdan