res_pjsip_outbound_registration: Allow to use multiple proxies for registration

Current registration code use pjsip_parse_uri to verify outbound_proxy
that is different from the reading this option for the endpoint. This
made value with multiple proxies invalid for registration pjsip settings.
Removing URI validation helps to use registration through multiple proxies.

ASTERISK-30217 #close

Change-Id: I064558e66f04b9f3260c46181812a01349761357

res/res_pjsip_outbound_registration.c

@@ -1827,20 +1827,8 @@ static int sip_outbound_registration_regc_alloc(void *data)
 		return -1;
 	}
 
-	if (!ast_strlen_zero(registration->outbound_proxy)) {
-		pj_strdup2_with_null(pool, &tmp, registration->outbound_proxy);
-		uri = pjsip_parse_uri(pool, tmp.ptr, tmp.slen, 0);
-		if (!uri) {
-			ast_log(LOG_ERROR, "Invalid outbound proxy URI '%s' specified on outbound registration '%s'\n",
-				registration->outbound_proxy, ast_sorcery_object_get_id(registration));
-			pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
-			return -1;
-		}
-	}
-
 	pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
 
-
 	ast_assert(state->client_state->client == NULL);
 	if (pjsip_regc_create(ast_sip_get_pjsip_endpoint(), state->client_state,
 			sip_outbound_registration_response_cb,