[Serusers] DNS Resolution of SDP-"Connection Address" at SER

[Greger V. Teigre]

Zeus Ng wrote:
> 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.

Well, we already do help the UA with nathelper, right?  The thing is, the 
telco model is to control all the components that are part of the service, 
often dump endpoints and a smart (and complicated) network. The Internet 
model is to have smart endpoints and a "dump" (simple) network.  When a 
standard has not matured enough, you get all sorts of endpoints.  I don't 
think helping them out a bit is that bad. It is bad if you get a complicated 
and hard to maintain network (i.e. ser.cfg).  However, this is short-term, 
until the dust settles and the endpoints start to behave.

> 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.

It will be better chance to develop the functionality in a new module. If 
this is of interest to anybody else, making a separate module means you can 
submit it as a contribution and maintain it yourself.  If you extend 
nathelper, you have to convince the maintainer to take it on and take over 
maintainance...
g-)

>
>
>> -----Original Message-----
>> From: Gerhard Zweimüller
>> Sent: Saturday, 11 June 2005 11:07 PM
>> To: serusers at 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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