Reference: https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/release_note/Cisco-Expressway-Release-Note-X8-8.pdf

Calls from registered systems to all other systems will use one RMS license, whenever those calls require the
Expressway to process the media streams. This includes, but is not limited to, the following call types:

— Business to business calls: previously required two RMS licenses, now require one on Expressway-E
— Business to consumer calls (Jabber Guest): previously required two RMS licenses, **now require one on the Expressway-E**
— Interoperability gateway calls (including Microsoft Lync / Skype for Business and third-part

There are 7 SKU for licensing Expressway.
Register the Expressway server first using the SKU: LIC-SW-EXP-K9
This is the Cisco TelePresence Software Upgrade Release Keys.
Quantity of '1' per server.

Apply this license file as the Expressway release key.
Then reboot and THEN apply the options to make it an expressway C or E with X number of RMS licenses.

For Expressway E register quantity of '1' of the below SKUs on cisco.com/go/license) and apply to the server

For Expressway E & C register quantity of '1' of each of the below and apply to the server

For Expressway E & C you then need to register the required number of RMS licenses which should be split across the Expressway C and Es (apply and reboot expressway) - note this is no longer correct - see above.

Note: the RMS license is the only multiple count license file you need. All others should have quantity of '1' when you register them.

Expressway LAN

Clustering requires you to use LAN 1 NIC and LAN 1 and LAN 2 must use non - opverlappying subnets. Clustering cannot use Static NAT, therefore LAN 2 should be used for your external facing interface.

Packet Capture trace

Below is not relevant any more, as you can capture from the GUI interface.
On expressway, log in as root and type: mkdir /mnt/harddisk/traces

cd /mnt/harddisk/traces

Then to activate the trace type: Interface 1, max 10 MB file

tcpdump -i 1 -w trace.cap -s 0 -C 10

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