[Serusers] Ser and Asterisk

[Aster]

SerUser,

I am trying to use SER and Asterisk on the same host/system. When i
try to make ser talk to asterisk, it failed and didn't want to talk to
it. But if i put asterisk on different system then ser has no problem
talking to asterisk.

Here is flow of the traffic:

UA  -----------   SER  ----------------<if PSTN> ------------ Asterisk
------------- Gateway.
                                              <if another user> ---------- UA

Could someone please give me an idea how to make ser talk to asterisk
on the same host.

TIA