Buffer overflow in CounterPath eyeBeam SIP Softphone allows remote attackers to (1) cause a denial of service (device crash) via SIP INVITE commands with a long header field name sent during startup and (2) cause a denial of service (device hang or crash) via SIP INVITE commands with a long header field name sent during a call.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24181
http://www.vupen.com/english/advisories/2006/0259
http://www.securityfocus.com/bid/16253
http://www.securityfocus.com/archive/1/446573/100/0/threaded
http://www.securityfocus.com/archive/1/422009/100/0/threaded
http://securityreason.com/securityalert/354