--- chan_sip.c	2004-11-16 14:14:42.000000000 -0500
+++ chan_sip.c_digest	2004-11-17 17:03:55.000000000 -0500
@@ -6354,6 +6354,8 @@
 	char cnonce[80];
 	char iabuf[INET_ADDRSTRLEN];
 
+	if (!strcmp(p->domain, "/"))
+		p->domain[0] = '\0';
 	if (!ast_strlen_zero(p->domain))
 		strncpy(uri, p->domain, sizeof(uri) - 1);
 	else if (!ast_strlen_zero(p->uri))