Fix loss of voice after second call drops (on a second line) in case using multiple lines on unistim phones. There is regression was introduced in r391379.

Reported by: Rustam Khankishyiev
(closes issue ASTERISK-23846)



git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@425667 f38db490-d61c-443f-a65b-d21fe96a405b