Update cheatsheets

sngrep

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sngrep
+
+> Display SIP calls message flows from terminal.
+> More information: <https://github.com/irontec/sngrep>.
+
+- Visualize SIP packets from a PCAP file:
+
+`sngrep -I {{path/to/file.pcap}}`
+
+- Visualize only dialogs starting with INVITE packets with RTP packets from a PCAP file:
+
+`sngrep -crI {{path/to/file.pcap}}`
+
+- Real-time interface with only dialogs starting with INVITE packets with RTP packets:
+
+`sngrep -cr`
+
+- Only capture packets without interface to a file:
+
+`sngrep -NO {{path/to/file.pcap}}`