Wouter, If you want to try with an opensource SIP-H.323 Gateway, there is Vovida's siph323csgw. It is not the most stable software in the world and not well maintained. However, it makes the trick to call from H.323 to SIP clients (we tried Netmeeting and MSN) and viceversa (you will need to restart it several times, though). There are commercial implementations, like RADVISION, that might help you much more on this. Jaime Bogdan-Andrei IANCU &lt;iancu(a)fokus.fraunhofer.de&gt; on 09/09/2003 14:44:22 Please respond to iancu(a)fokus.fraunhofer.de To: Wouter Prins &lt;wouter.prins(a)qi.nl&gt; cc: &quot;&#39;serusers(a)lists.iptel.org&#39;&quot; &lt;serusers(a)lists.iptel.org&gt; (bcc: Jaime GIL/EN/HTLUK) Subject: Re: [Serusers] SER in combination with a H.323 GK We do not support such features. To have some H.323 <-> SIP interpretability, you would need a SIP-H.323 gateway, but I not aware of any implementation (excepting the hardware version built by net.com) Regards, Bogdan Wouter Prins wrote: _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers ------------------------------------------------------------------------ ******************************************************************************* Important. Confidentiality: This communication is intended for the above-named person and may be confidential and/or legally privileged. Any opinions expressed in this communication are not necessarily those of the company. If it has come to you in error you must take no action based on it, nor must you copy or show it to anyone; please delete/destroy and inform the sender immediately. Monitoring/Viruses Orange may monitor all incoming and outgoing emails in line with current legislation. Although we have taken steps to ensure that this email and attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure they are actually virus free. Orange PCS Limited is a subsidiary of Orange SA and is registered in England No 2178917, with its address at St James Court, Great Park Road, Almondsbury Park, Bradley Stoke, Bristol BS32 4QJ. ******************************************************************************* ------------------------------------------------------------------------ _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers