Fix a regression where direct media was not permitted for calls using SIP INFO DTMF.

A change was committed to fix direct media ACL support. This change wrongly assumed that
only a single channel technology structure exists for chan_sip. This is in fact false as
a second exists for calls using SIP INFO DTMF. The code which performs direct media ACL
checking now checks for both the non-INFO DTMF and INFO DTMF channel technology structures.

(closes issue ASTERISK-20409)
Reported by: michele cicciotti privatewave
........

Merged revisions 373165 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@373179 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -30187,7 +30187,8 @@ static struct ast_udptl *sip_get_udptl_peer(struct ast_channel *chan)
 
 	if (!(opp_chan = ast_bridged_channel(chan))) {
 		return NULL;
-	} else if ((opp_chan->tech != &sip_tech) || (!(opp = opp_chan->tech_pvt))) {
+	} else if (((opp_chan->tech != &sip_tech) && (opp_chan->tech != &sip_tech_info)) ||
+		   (!(opp = opp_chan->tech_pvt))) {
 		return NULL;
 	}