Dynamic asterisk ring group on osmocom with subscriber on demand

[laptopfm]

So again with the help of LLM's i made a asterisk script that reads the autogenerated MSISDN from osmo-hlr and it makes a dynamic ringgroup that rings all available gsm handsets, This guide assummes you already have configured osmo-sip-connector and your asterisk with whatever sip trunk of your liking. FIrst of all you need to modify osmo-sip-connector to pass only the MSISDN to asterisk and not IMSI. You do it like this :

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app
 no use-imsi

on /etc/osmocom/osmo-sip-connector.cfg

then you need to create the asterisk script :

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sudo nano /var/lib/asterisk/agi-bin/gsm_ring_group.agi

then paste the following :

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#!/bin/bash
HLR_DB=/var/lib/osmocom/hlr.db

# consume the AGI environment handshake (required, even if unused)
while read -r line; do
  [ -z "$line" ] && break
done

DIALSTRING=""
while IFS='|' read -r msisdn; do
  [ -z "$msisdn" ] && continue
  if [ -z "$DIALSTRING" ]; then
    DIALSTRING="PJSIP/${msisdn}@osmo-connector"
  else
    DIALSTRING="${DIALSTRING}&PJSIP/${msisdn}@osmo-connector"
  fi
done < <(sqlite3 "$HLR_DB" "SELECT msisdn FROM subscriber WHERE msisdn IS NOT NULL AND msisdn != '' AND last_lu_seen IS NOT NULL AND last_lu_seen >= datetime('now', '-4 hours');")

echo "SET VARIABLE DIALSTRING \"${DIALSTRING}\""

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sudo chmod +x /var/lib/asterisk/agi-bin/gsm_ring_group.agi
sudo chown asterisk:asterisk /var/lib/asterisk/agi-bin/gsm_ring_group.agi

(might also need to tweak a few permissions)

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ls -la /var/lib/osmocom/hlr.db
sudo setfacl -m u:asterisk:r /var/lib/osmocom/hlr.db

After you make it you need to edit /etc/asterisk/extensions.conf and add the incoming from trunk part

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[from-voip-laptopfm]
exten => s,1,NoOp(Incoming call from voip-laptopfm - building GSM ring group)
 same => n,AGI(gsm_ring_group.agi)
 same => n,GotoIf($["${DIALSTRING}" = ""]?nohandsets)
 same => n,Dial(${DIALSTRING},30)
 same => n,Hangup()
 same => n(nohandsets),NoOp(No known GSM handsets currently attached)
 same => n,Hangup()

; in case FreePBX ever passes a DID digit-string instead of 's'
exten => 611,1,Goto(s,1)

After all this restart asterisk and try it out !