Open5GS + srsRAN

Core: Open5GS gNodeB: srsRAN UE: Samsung Galaxy S21

IMS kamailio?

Open5GS

Debian 11 VM (192.168.4.22) Note: Open5GS doesn't like 12's libcurl: [sbi] WARNING: ogs_sbi_client_handler() failed [-1] (../lib/sbi/path.c:62)

Installed Open5GS from osmocom Debian repo

Installed WebUI from git as per instructions

Configuration attached, based off Open5GS quickstart

• PLMN 00101
• net name ARFNET
• Corrected bind IP addresses, rest left at localhost

Added two UEs via WebUI, one sysmoISIM SIM #178, other made up for UERANSIM

Applied quickstart sysctl and NAT rules from quickstart

Start only neccesary services for 5G SA: smf, upf, nrf, scp, ausf, udm, pcf, nssf, bsf, udr, amf, [webui] in that order (not limited to)

srsRAN

osmocom's latest Open5GS build does not like latest srsRAN from git so here we use srsRAN github release 24.04

Baremetal Debian 12 desktop (192.168.4.8) N40 band, f=2380 arfcn=476000 width=20MHz (CNAF UN-50 indicates that 2370-2390 is for self-provision mobile networks)

Software: srsRAN 5G Hardware: USRP B200 mini with Leo GPSDO

Configuration based off the default gnb_rf_b200_tdd_n78_20mhz.yml

• PLMN 00101
• AMF IP address points to Open5GS

UERANSIM

Same baremetal desktop

Default custom config, just

• point to Open5GS
• PLMN 00101
• comment out sd in N-SSAI matching core

UE

Model: Samsung Galaxy S21 SIM: sysmoISIM-SJA5-S17 #178

Changed SIM IMSI PLMN to 00101 with pySIM, everything left as is

Insert in SIM slot 2 (the other is populated with an AVANZAFIBRA one) Mobile data to SIM slot 2 Manual network selection -> ARFNET

• ARFNET appears in the network list
• Registration successful
• Gets IPv4 address and route

Debugging

Attach wireshark to baremetal desktop, filter by SCTP and GTP to core

Attach tcpdump to core

State-of-the-art

Data works! Internet access check.

Resources

5G

https://5g.systemsapproach.org/

Open5GS

https://open5gs.org/open5gs/docs/guide/01-quickstart/

srsRAN

https://github.com/srsRAN/srsRAN_Project

VoNR

https://nickvsnetworking.com/ https://www.rfwireless-world.com/terminology/5g-vonr-architecture-call-flow https://www.sharetechnote.com/html/5G/5G_VoNR.html

https://open5gs.org/open5gs/docs/tutorial/02-VoLTE-setup/ https://kamailioasterisk.com/2023/07/19/volte-setup-with-kamailio-ims-and-open5gs-open-source/ https://ryantheelder.github.io/blog/2023/VoLTE

https://www.kamailio.org/w/2013/05/ims-kamailio/

Install kamailio

In Open5GS debian 11 machine

Install kamailio 6.0 commit ba13699fab from git following https://kamailio.org/docs/tutorials/6.0.x/kamailio-install-guide-git/ with dependencies from Dockerfile and modules.lst from https://github.com/herlesupreeth/docker_open5gs/blob/master/ims_base/modules.lst

• mysql 127.0.0.1:3306
• redis 127.0.0.1:6379
• IMS
  • pcscf: 127.0.0.30:3871
  • scscf: 127.0.0.31:3870
  • icscf: 127.0.0.32:3869
  • rtpengine: 127.0.0.1:2223
  • pyhss: 127.0.0.33:3875, 0.0.0.0:8080
• open5gs
  • scp: 127.0.0.200

Follow dockerfiles and scripts of https://github.com/herlesupreeth/docker_open5gs/blob/master/sa-vonr-deploy.yaml

• https://github.com/herlesupreeth/docker_open5gs/blob/master/ims_base/Dockerfile
• https://github.com/herlesupreeth/docker_open5gs/blob/master/icscf/icscf_init.sh
• https://github.com/herlesupreeth/docker_open5gs/blob/master/pcscf/pcscf_init.sh

Install rtpproxy from ubuntu at http://es.archive.ubuntu.com/ubuntu/pool/universe/r/rtpproxy/rtpproxy_1.2.1-2.2ubuntu1_amd64.deb lies actually, no rtpproxy

Proceed with configuration as per dockerfile

Attached systemd units under kamailio/ for running the pcscf, scscf and icscf as separate processes

rtpengine

Install rtpengine from https://github.com/sipwise/rtpengine following kamailioasterisk article

• install libxtables-dev and libtirpc-dev
• remove libiptables-dev from debian control file
• patch recording.c (colliding name in pcap, non breaking)
• ???
• profit (build and install deb package)

Attached patch for above by me, apply over e1941be950c24875122630564aa059d98299d8d1

Keep following rtpengine guide but ignore the recording bit (we aren't the NSA)

PyHSS

Follow dockerfiles still

But: copy lib/ and services/ to /etc/pyhss/pyhss and install systemd units attached

Adding subscribers described in README https://github.com/herlesupreeth/docker_open5gs

Install VoLTE stuff to SIM

https://osmocom.org/projects/cellular-infrastructure/wiki/VoLTE_IMS_Android_Carrier_Privileges