Anytone 878: support for DTMF contacts needs improvement - currently IDs get deleted von write

[allesand]

DTMF contacts are read correctly from the radio, the names are written back, but not the IDs, thus after write the DTMF contacts are not working anymore.

Request: either write back nothing and all or improve DTMF contact support so the IDs do not get deleted on write.

Workaround: use the Windows CPS and CSV import/export of the analog address book

Use case for DTMF contacts: switch talkgroups in SVXLink based FM networks - Anytone can not store "#" in the contacts but it works anyway