Netfors offers a free download version of Chan SS7.

Specification

• Compatible with Asterisk 1.2.x, 1.4.x, 1.6.x, 1.8.x, 11.x
• MTP2 (Q.703) implementation
• MTP3 (Q.704) implementation (subset)
• ISUP (Q.76x) implementation (mostly complete)
• Supports Dahdi/Zaptel compatible digital interfaces, e.g. Redfone, Sangoma, Digium or Openvox
• Facilities for protocol analysis using e.g. wireshark
• Supports high call volumes
• Supports multiple linksets with different OPCs and DPCs
• Supports linksets with multiple links
• Supports load sharing and MTP changeover
• Supports multiple hosts (cluster) configuration with load sharing and failover
• Flexible Dial command syntax to allow routing to different linksets

Availability

Chan SS7 is available either using svn or as a direct download.