IP-PBX softwares

Membangun IP PBX, Telepon Bebas Pulsa Berbasis IP Menggunakan Synology DiskStation
- December 10, 2016

3CX
www.3cx.com/phone-system/edition-comparison.html
+ FREE version available
+ call recording (commercial ed's only)

pbxnsip
www.pbxnsip.com/
+ FREE version available

Axon Virtual PBX
www.nch.com.au/pbx/index.html
- not free (https://secure.nch.com.au/cgi-bin/register.exe?software=axon)
* apakah internal modem bisa dipakai sebagai fxo ? Dumb (but not stupid) telephony cards

See also:
http://en.wikipedia.org/wiki/List_of_SIP_software

Related:
To disable auto change to Day Mode (for holidays):
...System \ 4.Week Table \ Time Setting