diff -rN -u old-telepathy-spec/telepathy/server/channel.py new-telepathy-spec/telepathy/server/channel.py
--- old-telepathy-spec/telepathy/server/channel.py      2006-11-07 18:51:13.000000000 +0200
+++ new-telepathy-spec/telepathy/server/channel.py      2006-11-07 18:51:13.000000000 +0200
@@ -716,6 +716,9 @@
         4 - CHANNEL_TEXT_SEND_ERROR_TOO_LONG
             The outgoing message was too long and was rejected by the
             server.
+        5 - CHANNEL_TEXT_SEND_ERROR_NOT_IMPLEMENTED
+            The channel doesn't support sending text messages to requested
+            contact.

         Parameters:
         error - one of the above integer errors