Delay when using ENUM with multiple records and no session agent

Hello,

 

I have ENUM configured to route calls and some numbers have 2 different ENUM entries with different orders, in order to provide alternate routing. No session agent is defined for the 1st ENUM entry. The call should be routed directly to the IP address (e.g. 1.2.3.4 below). 

When the target of the 1st ENUM record is not reachable, it takes about 30 seconds until the SBC tries the 2nd route.

Is there a way I can improve this?

 

Regards,

Alain

 

The ENUM records look like:

!^(.*)$!sip:\1@1.2.3.4;egress=realm1!
!^(.*)$!sip:\1@some-session-agent!