Make transfer not ignore port information with SIP.

Attempting to transfer with SIP to an address like 1XXXXX@ip.ad.re.ss:5061 would fail
because port would be cut from the host string and ignored. This simply keeps chan_sip
from cutting off the port number during these kinds of transfers.

(closes issue ASTERISK-19321)
Reported by: Federico Alves
Review: https://reviewboard.asterisk.org/r/1790/diff/#index_header
........

Merged revisions 358643 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 358644 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@358645 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -30584,9 +30584,9 @@ static int sip_sipredirect(struct sip_pvt *p, const char *dest)
 	char *extension, *domain;
 	cdest = ast_strdupa(dest);
-	
+
 	extension = strsep(&cdest, "@");
-	domain = strsep(&cdest, ":");
+	domain = cdest;
 	if (ast_strlen_zero(extension)) {
 		ast_log(LOG_ERROR, "Missing mandatory argument: extension\n");
 		return 0;