ISDN BRI circuits are mainly in use in Europe and South America.
Allo.com card is a PCI/PCIe (we sell both flavors please specify what you want) 2.2 compliant card supporting 2 or 4 BRI S/T interfaces. NT/TE mode can be independently configured on the card using a switch. Please note that we can autosense 3.3v and 5v automatically.
Our BRI cards are certified with Asterisk, Elastix, Trixbox, Freeswitch and YATES.
Allo.com cards use an ISDN controller chip from manufacturer Cologne for their ISDN cards and as such, voice quality is absolutely 100% the same like any other public vendors.
The reason why you can buy this card so cheap is because we develope and manufacture our own cards unlike most of the companies above.
SUPPORT for 1 hour in English by Skype, WebEx, email or phone
TRIAL period of 2 weeks . Get your money back if you are not happy.