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sngrep Build Status

sngrep is a tool for displaying SIP calls message flows from terminal.

It supports live capture to display realtime SIP packets and can also be used as PCAP viewer.

Some screenshots of sngrep



Building from sources


  • libncurses5 - for UI, windows, panels.
  • libpcap - for capturing packets.
  • libssl - (optional) for TLS transport decrypt using OpenSSL and libcrypt
  • gnutls - (optional) for TLS transport decrypt using GnuTLS and libgcrypt
  • libncursesw5 - (optional) for UI, windows, panels (wide-character support)
  • libpcre - (optional) for Perl Compatible regular expressions
  • zlib - (optional) for gzip compressed pcap files

On most systems the commands to build will be the standard autotools procedure:

make install (as root)

You can pass following flags to ./configure to enable some features

configure flag Feature
--with-openssl Adds OpenSSL support to parse TLS captured messages (req. libssl)
--with-gnutls Adds GnuTLS support to parse TLS captured messages (req. gnutls)
--with-pcre Adds Perl Compatible regular expressions support in regexp fields
--with-zlib Enable zlib to support gzip compressed pcap files
--enable-unicode Adds Ncurses UTF-8/Unicode support (req. libncursesw5)
--enable-ipv6 Enable IPv6 packet capture support.
--enable-eep Enable EEP packet send/receive support.

You can find detailed instructions for some distributions on wiki.


See --help for a list of available flags and their syntax

For example, sngrep can be used to view SIP packets from a pcap file, also applying filters

sngrep -I file.pcap host and port 5060

or live capturing, saving packets to a new file

sngrep -d eth0 -O save.pcap port 5060 and udp


You can configure some options using sngreprc file

Frequent Asked Questions

Any feedback, request or question are welcomed at #sngrep channel at

See FAQ on Github Wiki


sngrep - SIP Messages flow viewer
Copyright (C) 2013-2018 Irontec S.L.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

In addition, as a special exception, the copyright holders give
permission to link the code of portions of this program with the
OpenSSL library under certain conditions as described in each
individual source file, and distribute linked combinations
including the two.
You must obey the GNU General Public License in all respects
for all of the code used other than OpenSSL.  If you modify
file(s) with this exception, you may extend this exception to your
version of the file(s), but you are not obligated to do so.  If you
do not wish to do so, delete this exception statement from your
version.  If you delete this exception statement from all source
files in the program, then also delete it here.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <>.