Call doesn't end on callee site


my problem is when i call an extern number and i hang up the call doesn’t end on the callee. There its as if you haven’t hung up.

On the asterisk i get the warning
WARNING[25164]: chan_sip.c:3385 __sip_xmit: sip_xmit of 0x7f421401e0e0 (len 673) to returned -2: Resource temporarily unavailable

Do any of you know of the cause of this problem?
Thanks for the help in advance.

Assuming you are talking about SIP trunk, collect SIP packets for one such call and provide it here.
Seems like NAT issue.

–Satish Barot