Hi Robert, every H.323 calls has 2 fields to specify the destination and they can be used alone or together: The destination IP and the destination alias list. The user interfaces of different endpoints used different ways to allow the user to fill the fields. The standard (Annex O) way, that is for example used by Tandberg is <alias>@<ip>. Polycom and LifeSize use <ip>##<alias>. The ## is nothing a gatekeeper has to deal with. It sees the raw protocol messages and looks at destination IP and alias list if they are provided. In addition to that some Polycoms have a bug that they disregard the IP when they are registered to a gatekeeper, but thats a different story. Regards, Jan -- Jan Willamowius, Founder of the GNU Gatekeeper Project EMail : jan@xxxxxxxxxxxxxx Website: http://www.gnugk.org Support: http://www.willamowius.com/gnugk-support.html Robert Kulagowski wrote: > Some destinations that we try to dial tell our admin assistants that > to reach a VC, they need to dial ip.add.re.ss##123456 > > That seems like a TCS-4 dial string. How does the "##" get passed > through to the destination? Right now it looks like the GnuGK doesn't > send that, so that calls are failing. ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________________ Posting: mailto:Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_name=openh323gk-users Unsubscribe: http://lists.sourceforge.net/lists/listinfo/openh323gk-users Homepage: http://www.gnugk.org/