thanks for reply me ,Please read this link:
https://www.3cx.com/user-manual/installation-android/
Thank you so much for replying meIf you want to use a 3CX Client for Android, iOS or Windows you have to upgrade your Phone System to v15.5 SP6.
3CX v11 and clients are not supported anymore.
when I try to update the system I got this message "the Http server cannot be reached . please check the connection to the web server "If you want to use a 3CX Client for Android, iOS or Windows you have to upgrade your Phone System to v15.5 SP6.
3CX v11 and clients are not supported anymore.
sorry for the silly question but does the upgrade effect the configuration or the license , I'm affraid to lost everything when I done that can you please answer me specially the lic because I don't have the lic anymore ,I'm not the one who configure it and I don't have any Idea where the lic is ?If you want to upgrade from v11 to v15.5 SP6 please follow the upgrade path found here:
https://www.3cx.com/docs/manual/configuring-your-pbx/#h.k52p90c8u3ym
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Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.