diff -r 5157ec7a2b6f -r 841d24b3a2bc libpurple/protocols/jabber/presence.c
--- a/libpurple/protocols/jabber/presence.c	Fri Dec 28 17:14:52 2007 +0000
+++ b/libpurple/protocols/jabber/presence.c	Sat Dec 29 06:34:59 2007 +0000
@@ -265,6 +265,10 @@
 	xmlnode_set_namespace(c, "http://jabber.org/protocol/caps");
 	xmlnode_set_attrib(c, "node", CAPS0115_NODE);
 	xmlnode_set_attrib(c, "ver", VERSION);
+#ifdef USE_FARSIGHT
+	/* Make sure this is 'voice-v1', or you won't be able to talk to Google Talk */
+	xmlnode_set_attrib(c, "ext", "voice-v1");
+#endif
 	
 	if(js != NULL) {
 		/* add the extensions */