Verizon Wireless LTE/4G and SIP Header Manipulation

Tue Sep 22 16:56:32 UTC 2015

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-bounces at nanog.org] On Behalf Of Mark Stevens
Sent: Tuesday, September 22, 2015 11:03 AM
To: nanog at 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