# 4G VoLTE + 2G SMS Interworking Hosts
# Lab environment: YATE IMS core with YateBTS (OpenBTS)

# IMS Core (YATE/5.4.1) - S-CSCF / SMS-IWMSC
# Handles SIP registration, SMS routing, SS7 signaling
192.168.168.183  📞 S-CSCF

# 2G UE via YateBTS/3.1.3 - GSM mobile station
# Registers via SIP/UDP, sends/receives SMS over RP-DATA
192.168.168.238  📱 UE-2G

# SMSC - Short Message Service Centre
# MAP/TCAP over SCTP/M2PA for SMS store-and-forward
192.168.168.222  📨 SMSC

# VoLTE UE (iPhone, iOS/8.1) - LTE mobile station
# Registers via SIP/TCP over IPv6, SMS over IMS (SMSoIP)
fd00:183:1:1:1886:9040:8605:32b8  📱 UE-VoLTE

# P-CSCF - Proxy-CSCF (IMS entry point for VoLTE UE)
fd01::183  📞 P-CSCF

# GTP-U tunnel endpoints (SGW / PGW on loopback)
# Carry tunneled SIP/SMS between VoLTE UE and IMS core
127.0.1.1    🚪 SGW
127.0.1.100  🌐 PGW
