ICTContact is built over open source Asterisk PBX as back-end telephony server. It supports SIP, IAX2 and DAHDI technologies. Furthermore, ICTContact supports almost all free codecs.
Asterisk PBX supports both SIP, IAX2 and DAHDI technologies. That is why ICTContact has been designed to support all the widely used VoIP technologies with built-in support. Furthermore, ICTContact also support almost all free codecs. This feature makes ICTContact one of the best auto dialer software that support all major VoIP technologies including SIP, IAX2 and DAHDI.