Hello!Look this document:ADMINISTRATIONGUIDECisco SPA100 Series Phone AdaptersSPA112 and SPA122http://www.cisco.com/en/US/docs/voice_ip_comm/csbpvga/spa100-200/admin_guide/SPA100_AG_OL-25117.pdfPages 95-96: Example 1:*1xxxxxxxxxx<:@fwdnat.pulver.com:...