chan_sip: Set Quality of Service for video rtp instance

(closes issue ASTERISK-20201)
Reported by: ddkprog
Patches:
    chan_sip.c.diff uploaded by ddkprog (license 6008)
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Merged revisions 373617 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 373631 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@373632 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -5583,6 +5583,7 @@ static int dialog_initialize_rtp(struct sip_pvt *dialog)
 		ast_rtp_instance_set_keepalive(dialog->vrtp, dialog->rtpkeepalive);
 
 		ast_rtp_instance_set_prop(dialog->vrtp, AST_RTP_PROPERTY_RTCP, 1);
+		ast_rtp_instance_set_qos(dialog->vrtp, global_tos_video, global_cos_video, "SIP VIDEO");
 	}
 
 	if (ast_test_flag(&dialog->flags[1], SIP_PAGE2_TEXTSUPPORT)) {