Open ticket system for ISP?

Question

Helpdesk

Good afternoon. Tell me a quality ticket - a system for an Internet provider, for those. support. Now I use google-calendar with breaking orders by the hour, but the company is growing and there will already be several linear-cable sections.
It is required approximately the same - to break up the outfits according to the calendar, however, so that only the head of one or another cable section sees his task.
Tried Request Ticket - not very convenient.
Or do not bother and create several calendars and give access to whoever needs it?
I saw this question in Q&A - habrahabr.ru/qa/11777/ , however, the system ticket for development is considered there, rather than for the work of installers in the ISP.

Answer 1

Look towards OTRS, licensed gpl3