Send all of your signaling over TLS and they won't be able to see or modify it.
Steven Naslund Chicago IL -----Original Message----- From: NANOG [mailto:nanog-boun...@nanog.org] On Behalf Of Mark Stevens Sent: Tuesday, September 22, 2015 11:03 AM To: nanog@nanog.org Subject: Verizon Wireless LTE/4G and SIP Header Manipulation Hi All, Has anyone seen that something (most likely an alg) on Verizon's LTE/4G network is rewriting SIP headers,in particular From Tag identifiers? We cannot make a SIP call from our cellphones (using cellular data) beyond 30 seconds because the TAGs are rewritten and the destination Asterisk server drops the call because of this. Thanks Mark
