14 Apr
2005
14 Apr
'05
11:42 a.m.
On 04/14/05 05:10, Jack Damn wrote:
Hi,
I have a problem with registering with a UAS when using SER as a stateful proxy.
The UAS stores the UAC IP address in it's binding list.
This IP address was obtained by the Contact header field.
Now if the UAS receive a call and needs to contact my UAC, an INVITE is sent
directly to the UAC IP address instead of sending it to the proxy for relaying.
What is the normal behavior of a UAS when receiving a REGISTER that is coming
from a proxy server ? Sould it save the proxy IP address in it's
bindings table ?
If the UAS does the registrar functionality, then it must save the
address from the Contact header. But you will get in troubles if the
client is behind the NAT -- the UAS will be unable to detect NAT-ed
clients. Storing only the proxy IP will be useless if the proxy does not
store the contact address of the client. Storing both, the UAS can use
the proxy as an outbound relay, but must use the contact address in the
SIP request.
Another question:
Is it acceptable per RFC for a UAS to rewrite the SIP VIA headers and
concatenate them
on a single, separated by commas ?
Don't ask me the reason for this, but I have noticed a UAS doing just
that and I need to know
if this is just wrong or acceptable.
Yes, it can concatenate same headers in one separated by commas. The RFC
allow both forms, so there should be no interoperability issue.
Daniel
Thanks,
Jack
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