Abilis VoIP Account is not configured or wrongly configured. Configure the Abilis VoIP account properly. See Abilis VoIP Account.

The phone has no data connectivity available, because it was totally disabled (airplane mode) or partially disabled (only WiFi or only mobile networks. Mobile network may be also disabled distinguishing GSM data connections (GPRS/EDGE) and WCDMA (UMTS/HSDPA). Enable desired connection types in the phone settings.

The abilisphone settings block connection on mobile networks and or WiFi (check settings). Default value for mobile networks is disabled. Enable desired connection types in the abilisphone settings.

The phone is in an area without known Wi-Fi networks or without mobile network data coverage. Move in an area with data coverage.

The connection is temporarily not available because the phone was just waken up and it is switching to WiFi connection (normally the connection switches to mobile networks or is disabled during sleeping). Wait some second and/or to avoid this trouble in future you may keep WiFi on during the sleep (select Phone Settings->Wi-Fi settings, press the menu button in the phone, click on advanced option, tap on Keep Wi-Fi on during sleep and select "never". In italian this option is called: "Crit.mod.sosp. Wi-Fi").

Abilis server is down or not reachable. Try to ping the Abilis or access its web interface. If it does not answer it may be off. Verify Abilis status and reachability.

DISA and/or callback number were not set in abilisphone settings or Abilis features are disabled. Configure the number i.e. +39123456789 and/or enable Abilis features.

The GSM is not available because the SIM is missing or without credit. Check SIM presence and credit.

The GSM network is not available because missing coverage. Move in a GSM covered area.

Connectivity troubles. See the FAQ on Abilis VoIP registration troubles about network connections and settings.

XMPP account is not correctly configured. See Chat server account.

The phone is in Wi-Fi, reaching the XMPP via public address and XMPP server is reached via a port forwarding on the Abilis working as Internet gateway. It needs Abilis CPX 7.5.0 and above versions to work properly.

Use NCP VPN App, available on google marker https://play.google.com/store/apps/details?id=de.ncp.vpn.basic.

Configure Abilis as you configure VPN for iPhone (see Abilis manual).

Install LDAP-Sync

Add LDAP-sync in Settings->Accoutn and Synchronization->New Account,

Configure LDAP-sync parameters:

Enable the synchronization (use it in safe areas as your company WiFi). Once synchronized you can use it offline and via Abilisphone address book.