ohrwurm is a small and simple RTP fuzzer that has been successfully tested on a small number of SIP phones.
Rebind is a tool that implements the multiple A record DNS rebinding attack. Although this tool was originally written to target home routers, it can be used to target any public (non RFC1918) IP address. Rebind provides an external attacker access to a target router’s internal Web interface.
This tool is first an LLMNR and NBT-NS responder, it will answer to *specific* NBT-NS (NetBIOS Name Service) queries based on their name suffix (see: http://support.microsoft.com/kb/163409). By default, the tool will only answers to File Server Service request, which is for SMB. The concept behind this, is to target our answers, and be stealthier on the network.
SIPp is a free Open Source test tool / traffic generator for the SIP protocol. It includes a few basic SipStone user agent scenarios (UAC and UAS) and establishes and releases multiple calls with the INVITE and BYE methods. It can also reads custom XML scenario files describing from very simple to complex call flows.