GSMA mandates 3GPP compliance to fix emergency roaming on VoLTE networks

The transition to packet-switched voice removes the safety net of legacy 2G/3G fallback, making technical interoperability a life-critical requirement rather than a performance goal. For the streaming and IoT sectors, this shifts the infrastructure burden toward IMS-based signaling and necessitates more rigorous field testing over network simulators. As operators refarm spectrum for 5G, failure to standardize emergency protocols creates significant regulatory and reputational risk, particularly for travelers in markets like the U.S. where legacy networks are already dark. Watch for the completion of the GSMA's 'Work Item' on IMS robustness, which will establish permanent reference documents for 4G/5G emergency stability.

The push for packet-switched reliability follows high-profile failures in legacy network transitions. Per the Australian Communications and Media Authority (ACMA), a massive Optus outage in November 2023 prevented over 200 emergency calls from connecting, largely because devices remained 'camped' on failing 3G signals instead of switching to other available networks. This incident directly informed the subsequent 3GPP amendments mentioned by the GSMA, highlighting the danger of devices becoming trapped on a malfunctioning home network when alternative packet-switched paths exist.

In the United States, the Federal Communications Commission (FCC) has implemented the Mandatory Disaster Response Initiative (MDRI) to address similar systemic vulnerabilities. Per the FCC's March 2024 order, all facilities-based mobile providers were required to comply by May 1, 2024, with new rules mandating bilateral roaming arrangements and mutual aid during emergencies. These regulations aim to ensure that as 2G and 3G networks disappear, the remaining 4G and 5G infrastructure can support reasonable roaming for all compatible devices regardless of the user's home carrier.

The scale of this transition is significant: per GSMA Intelligence data from late 2025, over 60 networks were scheduled for shutdown in that year alone, with more than 130 expected to close by 2030. This infrastructure shift is also moving beyond voice; regulators in the EU are currently assessing requirements for eCall systems in vehicles to migrate to VoLTE to maintain automated emergency signaling post-sunset. Furthermore, 3GPP is currently standardizing Voice over New Radio (VoNR) enhancements, which are expected to lower emergency call setup times to under 1.5 seconds, compared to the 2.6-second average for current VoLTE implementations.