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Fix the local ringback tone when 180 with SDP received, REF 15058

Grzegorz Sluja requested to merge early_media_fix_180_with_sdp into asterisk_chan_voicemngr_rdkb 
Fix the local ringback tone when 180 with SDP received, REF 15058

When the 180 Ringing message is received as a response to INVITE
by pjsip it sends the AST_CONTROL_RINGING to voicemngr channel when
there is no SDP body and AST_CONTROL_PROGRESS when there is SDP.
Incoming SDP body in 180 Ringing does not actually say that there
will be any incoming RTP early media packets from remote so we
need to start local ringback tone for both cases if there is no
incoming RTP packet received.

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