OpenIMSD

VoLTE test setup

To improve testing and developing with VoLTE and LTE, I've created a full VoLTE setup in a single VM including the EPC. The scripts to create the VM can be found on the gitlab of postmarketOS. A full debian image containing the network with PLMN 901/70 can be downloaded from the blog. Additional documentation is also available in the project repository.

Everything on the graph except the eNodeB is in the VM:

A graph of a classic 4G EPC including a IMS for VoLTE

The setup is build with the following software components:

MME: open5gs-mmed
SGW: open5gs-sgwcd/sgwud
PGW: open5gs-amfd/upfd
HSS: pyhss
IMS: kamailio as p-cscf, i-cscf, s-cscf
PBX: asterisk
dns: dnsmasq to offer dns overrides
redis: pyhss internal communication
mariadb: pyhss & kamailio persistent db
pyhss-cli: a simple cli to manage pyhss subscribers

The VM network setup is:

first interface: dhcp client. This interface will be used to nat UE traffic and for the VM iteself.
second interface: RAN interface, to connect a eNodeB (static addresses, no dhcp)

If you've a good SDR and GPSDO available, you can also use srsRAN to create a eNodeB.

OpenIMSD

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