diff -r channels/chan_sip.c ../asterisk-1.8.3/channels/chan_sip.c
9926,9951d9925
< /*! \brief Respond with minimum sec-agree negotiotion */
< static int transmit_response_with_sec_agree(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *randdata, enum xmittype reliable, const char *header, int stale)
< {
< 	struct sip_request resp;
< 	char tmp[512];
< 	int seqno = 0;
< 
< 	if (reliable && (sscanf(get_header(req, "CSeq"), "%30d ", &seqno) != 1)) {
< 		ast_log(LOG_WARNING, "Unable to determine sequence number from '%s'\n", get_header(req, "CSeq"));
< 		return -1;
< 	}
< 	/* Choose Realm */
< 	get_realm(p, req);
< 
< 	/*
< 		Digest algorithm and security server are hardcoded to be compatible with Nokia SIP client default parameters.
< 		According to RFC3329 they must be dinamically negotiated.
< 	*/
< 	snprintf(tmp, sizeof(tmp), "Digest algorithm=MD5, realm=\"%s\", nonce=\"%s\"%s", p->realm, randdata, stale ? ", stale=true" : "");
< 	respprep(&resp, p, msg, req);
< 	add_header(&resp, header, tmp);
< 	add_header(&resp, "Security-Server", "digest");
< 	append_history(p, "AuthChal", "Auth challenge sent for %s - nc %d", p->username, p->noncecount);
< 	return send_response(p, &resp, reliable, seqno);
< }
< 
13426,13433d13399
< 		if(!strcmp(get_header(req, "Require"), sip_options[18].text)){//18 corresponds to sec-agree in sip.h
< 			/* Here comes the RFC3329 negotiation in the case where the client initates the security agreement*/
< 			/* We have no auth, so issue challenge and request authentication */
< 			set_nonce_randdata(p, 1); /* Create nonce for challenge */
< 			transmit_response_with_sec_agree(p, "494 Security Agreement Required", req, p->randdata, reliable, respheader, 0);
< 			sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
< 			return AUTH_CHALLENGE_SENT;
< 		}
diff -r channels/sip/include/sip.h ../asterisk-1.8.3/channels/sip/include/sip.h
1758c1758
< 	{ SIP_OPT_SEC_AGREE,	SUPPORTED,	"sec-agree" },
---
> 	{ SIP_OPT_SEC_AGREE,	NOT_SUPPORTED,	"sec_agree" },