[Serusers] CISCO returns "481 Call Leg/Transaction Does Not Exist"

[- zaki -]

Hi,

I'm using ser-0.8.12 for SIP proxy and CISCO2651XM(12.2(11)T8) as
media gateway for PSTN.

When any subscriber call to PSTN via CISCO media gateway, CISCO
returns "SIP/2.0 183 Session Progress", and if caller hang up
before called party in PSTN pick up a call, CISCO send a packet of
"SIP/2.0 481 Call Leg/Transaction Does Not Exist" and call between
CISCO and PSTN called party is not hung up.
(Called party phone continue ringing)

(I consider that transaction before caller party pick up is not added
 CISCO's transaction table.)

Could anyone please let me know how to terminate a call between
CISCO media gateway and called party in PSTN?

Regards,

--
  - zaki - YAMAZAKI Noriyuki, Director of EDGE Co., Ltd.
    +81-3-5749-9621(Phone), +81-3-5749-9910(Fax), zaki at edge.jp