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CME with SIP trunk unstable behavior


i have CME v4.1 running on 2621XM (adventerprisek9-mz.124-15.T13), i have direct internet connection on fa0/1 (Public IP address,not NAT)

i can call outside numbers without any problem ,sometimes i also can receive calls from the outside and sometimes it doesn't work, i just got the from the callingphone (that this numer is not online , or the call ended by the other party)

i add the " keepalive target" in sip-ua config to keep router connected all the time to the SIP SP, and now i have another issue , when i can my number it does ring and when i pickup the router send OK messages to the SP but without any ACKs so the calling party still showing ringing and after 25 sec the call end.

when it does work randomly and i hanged the call from my 7970 phone i got this

May 31 19:29:00.792: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
SIP/2.0 481 Call Leg/Transaction Does Not Exist
Via: SIP/2.0/UDP;branch=z9hG4bK8b348f9bf1e64ae6a9fdcedbdf1c4d2f
From: <>;tag=4e0113ac4bf5342044db98
To: <sip:sam72844@myip:5060>;tag=A7AA24-E0A
Call-ID: 6e405c47fcb540a38063967607c3ce73
CSeq: 8 BYE
Content-Length: 0

and then the system goes kind of offline and doesn't receive any more calls, after a period of time or by reloading the router i go back to point  zero.

here is  the config and debug ccsip messages when the call is being received

in the debug file you'll see "my ip " and "number" i just edited these 2 entries for privacy

Kindly help ..


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