FS-7463 #resolve

allow intercept of replaced call-id when processing the replaces header by providing a a-leg parameter in replaces header.
without this change one leg calls could not be picked because there is no bridge_uuid

src/mod/endpoints/mod_sofia/sofia.c

@@ -9895,21 +9895,28 @@ void sofia_handle_sip_i_invite(switch_core_session_t *session, nua_t *nua, sofia
 																						   "%sanswer,sofia_sla:%s", codec_str, b_private->uuid);
 					}
 				} else {
-					if (!zstr(bridge_uuid)) {
+					char *a_leg = NULL;
+					if (sip->sip_replaces && sip->sip_replaces->rp_params && sip->sip_replaces->rp_call_id) {
+						a_leg = switch_find_parameter(*(sip->sip_replaces->rp_params), "a-leg", switch_core_session_get_pool(session));
+					}
+					if(a_leg) {
 						switch_channel_mark_hold(b_channel, SWITCH_FALSE);
-						tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,intercept:%s", bridge_uuid);
+						tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,intercept:%s", sip->sip_replaces->rp_call_id);
+						switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "call %s picked up on a-leg\n", sip->sip_replaces->rp_call_id);
 					} else {
-						const char *b_app = switch_channel_get_variable(b_channel, SWITCH_CURRENT_APPLICATION_VARIABLE);
-						const char *b_data = switch_channel_get_variable(b_channel, SWITCH_CURRENT_APPLICATION_DATA_VARIABLE);
-
-						if (b_data && b_app) {
-							tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,%s:%s", b_app, b_data);
-						} else if (b_app) {
-							tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,%s", b_app);
+						if (!zstr(bridge_uuid)) {
+							switch_channel_mark_hold(b_channel, SWITCH_FALSE);
+							tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,intercept:%s", bridge_uuid);
+						} else {
+							const char *b_app = switch_channel_get_variable(b_channel, SWITCH_CURRENT_APPLICATION_VARIABLE);
+							const char *b_data = switch_channel_get_variable(b_channel, SWITCH_CURRENT_APPLICATION_DATA_VARIABLE);
+							if (b_data && b_app) {
+								tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,%s:%s", b_app, b_data);
+							} else if (b_app) {
+								tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,%s", b_app);
+							}
+							switch_channel_hangup(b_channel, SWITCH_CAUSE_ATTENDED_TRANSFER);
 						}
-
-
-						switch_channel_hangup(b_channel, SWITCH_CAUSE_ATTENDED_TRANSFER);
 					}
 				}