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

[Zeus Ng]

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 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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