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CompletePBX GUI Changes

The default value for call back delay is set to 5 (PBX->Applications->Call Back) to avoid making a call back while the callee is still busy.
Improved the User Device field value validation (PBX->Extensions)
Ring Group number can be longer than 10 digits now

Import extensions: Ring Device=Yes is now the default
Hot desking extensions now support being used as dynamic queue members
Fixed two problems in the API create_extension function:
- When using create_extension using an existing extension number, the API modified the extension instead of rejecting the command. Fixed.
- Next suggested extension number now takes into account API-created extensions
CDR table encoding is changed to UTF-8. It allows now to keep the not Latin Caller ID names

DAHDI configuration utility (ddetect) creates new FXS extensions with Attach Voicemail = No. This is the default value when an extension is created via GUI (PBX->Extensions)

Fix a problem with Yealink T27P and T21P-E2 handsets support in Endpoint Manager
Endpoint Manager now supports configuration of a second account for GrandStream HT702 ATA

The discovered endpoint IP addresses are displayed now in the Device Mapping dialog