thanks for you answer,

here is the full debug

You have connectivity issue. The response that the CME is sending, is not received by the caller side. That is why it kept sending.

And same happens when caller side cancels the call, GW sends response and delete from its memory, but caller proxy keep sending it, so gw sends 487 msg.

All response will be sent to 77.72.169.134. Can you check if there is anything that could drop the packet or not?

Thank you

thanks for you quick response

all i can tell you regarding connectivity that cme router has public ip address from ISP directly connected to its fa0/1

i can ping this ip address from the router

CME#ping 77.72.169.134

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 77.72.169.134, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms

but i can not trace route it

CME#traceroute 77.72.169.134

Type escape sequence to abort.
Tracing the route to 77.72.169.134

  1 82-168-191-254.ip.telfort.nl (82.168.191.254) 16 msec 16 msec 16 msec
  2 172.26.42.33 16 msec 16 msec 16 msec
  3  *  *  *
  4 195.190.227.223 20 msec 20 msec 20 msec
  5 ffm-s1-rou-1022.DE.eurorings.net (134.222.229.18) 36 msec
    obl-rou-1021.NL.eurorings.net (134.222.229.137) 20 msec
    obl-rou-1021.NL.eurorings.net (134.222.229.129) 16 msec
  6 ffm-s1-rou-1022.DE.eurorings.net (134.222.231.138) 36 msec 36 msec 36 msec
  7 ffm-s1-rou-1006.DE.eurorings.net (134.222.227.10) 56 msec 52 msec *
  8  *  *  *
  9  *  *  *
10  *  *  *
11  *  *  *
12  *  *  *
13  *  *  *
14  *  *  *
15  *  *  *
16  *  *  *
17  *  *  *
18  *  *  *
19  *  *  *
20  *  *  *
21  *  *  *
22  *  *  *
23  *  *  *
24  *  *  *
25  *  *  *
26  *  *  *
27  *  *  *
28  *  *  *
29  *  *  *
30  *  *  *

CME#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 0.0.0.0 to network 0.0.0.0

C    192.168.10.0/24 is directly connected, FastEthernet0/0
     82.0.0.0/32 is subnetted, 1 subnets
S       82.168.191.254 [254/0] via *my ip address*, FastEthernet0/1
S*   0.0.0.0/0 is directly connected, FastEthernet0/1
C    195.240.*.0/21 is directly connected, FastEthernet0/1

is th there any debug output you would like to see ??? kindly advice

thank you