[Asterisk-Users] SIP problem with asterisk

[George Lin]

HI List,

I have two SIP phones. one is 6002, w:

which is behind a NAT, and another is 5009 which has public IP .

When a call between 6002 to 5009, the 6002 cannot hear any from 5009, and
5009 did hear from 6002.

And in the sip debug, I see following message

Sip read:
SIP/2.0 481 CallLeg/Transaction Does Not Exist


and I specified in sip.conf
[6002]

type=friend
host=dynamic
nat=1
qualify=yes

[5009]

type=friend
host=dynamic
nat=1
qualify=yes

Can anyone help me what can be wrong ???

Thanks,

George Lin