[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