[SIP Beyond VoIP] STUN keep-alive

[Mihai Richard]

Hello,

I am having some problems with starting an audio call between two clients if
they registered at some time one from another(aprox. 1 minute). I used ngrep
to see sip traffic and this is what I saw: if clients register at aprox. the
same time(less then a minute apart) if one of them sends the INVITE message
the other client receives it, however if they¹ve registered at some time one
from another, the first client to have registered does not receive the
INVITE. With ngrep on the server I see that the server receives the INVITE
from one client and attempts to send it to the other client several times
but without success.

My guess is that this happens because the route created through the NAT by
the client not receiving the INVITE is closed due to inactivity. My question
is how could I send some messages to the server and keep that route open?

Also if I try to start an audio call from the client that didn¹t receive the
INVITE, the call starts normally but on the server I see that the packets
containing the INVITE message have a different source port than the packets
containing the REGISTER messages from the same client.

Thank you,
Mihai Richard
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