Summary
The remote host is running a SIP Express Router.
A bug has been found in the remote device which may allow an attacker to crash this device by sending a too long contact list in REGISTERs.
Solution
Upgrade to version 0.8.11 or use the patch provided at:
http://www.iptel.org/ser/security/secalert-002-0_8_10.patch
For additional details see: http://www.iptel.org/ser/security/