Hello, On 07.11.17 15:51, Abdul Basit wrote: event_route[dialog:start] is executed when 200ok response for INVITE is received, so there is no SIP request to suspend at that time. Using evapi_relay() should be fine in my opinion here. There is support to suspend routing of sip responses as well, but not sure if it is really useful in this case, you just need to notify cgrates that the call has started, no reason to wait for a reply from cgrates before forwarding the sip response. Note that evapi_relay() is not blocking the sip routing, so it terms of performances is in pair with async option. Cheers, Daniel -- Daniel-Constantin Mierla www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training, Nov 13-15, 2017, in Berlin - www.asipto.com Kamailio World Conference - www.kamailioworld.com