diff --git a/contrib/scripts/sip_to_pjsip/sip_to_pjsip.py b/contrib/scripts/sip_to_pjsip/sip_to_pjsip.py
index a4f03b5085b682bc504caac23a7c1f8bb91057b2..4a6004ae125a63e9d56a5cbd1d13df2bb911b252 100755
--- a/contrib/scripts/sip_to_pjsip/sip_to_pjsip.py
+++ b/contrib/scripts/sip_to_pjsip/sip_to_pjsip.py
@@ -926,6 +926,17 @@ class Registration:
         the right of the user, then finish by using rpartition calls to remove
         everything to the left of the user.
         """
+        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(':')
         if (colons == 3):
             # :domainport:secret:authuser
@@ -946,11 +957,7 @@ class Registration:
             # Invalid setting
             raise
 
-        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('@')
 
     def write(self, pjsip, nmapped):
         """