--- contrib/scripts/sip_to_pjsip/sip_to_pjsip.py	(Asterisk 13.10.0)
+++ contrib/scripts/sip_to_pjsip/sip_to_pjsip.py	(working copy)
@@ -909,2 +926,13 @@
         """
+        self.peer = ''
+        self.protocol = 'udp'
+        protocols = ['udp', 'tcp', 'tls']
+        for protocol in protocols:
+            position = user_part.find(protocol + '://')
+            if -1 < position:
+                post_transport = user_part[position + 6:]
+                self.peer, sep, self.protocol = user_part[:position + 3].rpartition('?')
+                user_part = post_transport
+                break
+
         colons = user_part.count(':')
@@ -929,7 +957,3 @@
 
-        pre_domain, sep, self.domain = pre_auth.partition('@')
-        self.peer, sep, post_peer = pre_domain.rpartition('?')
-        transport, sep, self.user = post_peer.rpartition('://')
-
-        self.protocol = transport if transport else 'udp'
+        self.user, sep, self.domain = pre_auth.partition('@')