diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 5756edf576c165c12c392475cb60ca46f5603d73..3700ea9fb961433cfcbdaf19a6e4c7ccd517bfc7 100755
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -8043,7 +8043,7 @@ static int build_reply_digest(struct sip_pvt *p, int method, char* digest, int d
 	ast_md5_hash(resp_hash,resp);
 	/* XXX We hard code our qop to "auth" for now.  XXX */
 	if (!ast_strlen_zero(p->qop))
-		snprintf(digest, digest_len, "Digest username=\"%s\", realm=\"%s\", algorithm=MD5, uri=\"%s\", nonce=\"%s\", response=\"%s\", opaque=\"%s\", qop=\"%s\", cnonce=\"%s\", nc=%s", username, p->realm, uri, p->nonce, resp_hash, p->opaque, "auth", cnonce, "00000001");
+		snprintf(digest, digest_len, "Digest username=\"%s\", realm=\"%s\", algorithm=MD5, uri=\"%s\", nonce=\"%s\", response=\"%s\", opaque=\"%s\", qop=auth, cnonce=\"%s\", nc=00000001", username, p->realm, uri, p->nonce, resp_hash, p->opaque, cnonce);
 	else
 		snprintf(digest, digest_len, "Digest username=\"%s\", realm=\"%s\", algorithm=MD5, uri=\"%s\", nonce=\"%s\", response=\"%s\", opaque=\"%s\"", username, p->realm, uri, p->nonce, resp_hash, p->opaque);