Just a short note and/or question: how are FQDN in SDP suppose to work if the
FQDN is only resolveable in the local network (especially behind NAT)?
And how should or can a UA determine if its FQDN is only locally resolveable
or not?
IMHO FQDN in SDP only introduces additional trouble with NATs.
Regards
Nils
On Monday 13 June 2005 15:03, Gerhard Zweimüller wrote:
Thanks for your answer.
The funny thing is: I am trying quite hard to convince the vendor (actually
a well-known VoIP-chip/module/appliance maker) that FQDN in SDP is a good
(and allowed) thing.
Even more funny: In the preceding firmware-release FQDN was no problem. But
in the current release they apparently *removed* the FQDN-support and now
they try to convince me that FQDN in SDP is not allowed :-( Although I
sent them RFCs and everything to prove them wrong.
But there you go.
I tried your suggestion with fix_nated_sdp and so far it seems to work.
Thanks for the tip!
Hopefully the vendor will change its RFC-support policy soon.
Kind regards,
Gerhard
-----Original Message-----
From: Zeus Ng [mailto:zeus.ng@isquare.com.au]
Sent: Sunday, June 12, 2005 8:30 AM
To: Gerhard Zweimüller
Cc: serusers(a)lists.iptel.org
Subject: RE: [Serusers] DNS Resolution of SDP-"Connection Address" at SER
Forcing SER to do stuff in order to fix problem UA implementation, I don't
think this is a good approach. Using FQDN as connection information in SDP
is the recommended approach in RFC 2327, though few UA do this. I would
suggest you contact the vendor to fix the UA that can't work with DNS.
Have a look on the fix_nated_sdp() function in nathelper. I haven't tried
this before but it might work. However, there is no guarantee. Let us know
if it works.
-----Original Message-----
From: Gerhard Zweimüller
Sent: Saturday, 11 June 2005 11:07 PM
To: serusers(a)lists.iptel.org
Subject: [Serusers] DNS Resolution of SDP-"Connection Address" at SER
Hi Serusers,
I have a problem with DNS resolution in SIP/SDP "Connection
Information"
/ "ConnectionAddress". Maybe somebody can help me:
In the network we use SIP-UAs that are integrated into ADSL-Modems
from Allied Telesyn (AT RG 634).
The SIP-client itself works OK. But when the unit is given a
system-name in the configuration, it will always use its DNS-name
instead of its IP-addr as "Connection Address" in the "Connection
Information" in SDP in INVITE and corresponding OK messages.
Now we want to add SIP-UAs that are NOT capable of resolving DNS-Names
in the "Connection Address" field.
Alle messages pass through SER of course and the SDP-part so far
remains unchanged.
Now my question to the list:
Is there a simple way of forcing SER to do the DNS-resolution of in
incoming message, put in the IP-address in "Connection Address" and
forward it to the other UA?
Thanks a lot in advance!
Gerhard
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