You are here: CSP Developer’s Guide: Internet Protocols > 4 Session-Initiation Protocol (SIP) Software > Hardware Requirements
The following hardware is required to implement the SIP feature and supporting software applications in the current release:
• Matrix Controller Series 3 card (hereafter referred to as the Matrix Controller)
• Chassis - Excel 2040, 2090 or 2110
• IP Network Interface Series 2 card or VDAC-ONE card for RTP streaming
• DSP-2 card or DSP-ONE card for DTMF tone detection and generation on the PSTN.