thanks for the reply.
I know that my hard phone supports this header (polycom). Where and how do I add this header?

1. Brekeke Product Name and version: 2.0.7.2 2. Java version: 1.5 3. OS type and the version: Linux 4. UA (phone), gateway or other hardware/software involved: 5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/networkpatterns.html : 6. Your problem: Plan to use Brekeke SIP ...