As the number of 2G and 3G networks decrease, IP Multimedia Services (IMS) come as the enabler for Voice over LTE (VoLTE), RCS, VoWiFi, and SMSoIP. It is a key solution for MNOs that allows operators to diversify offerings, implement new pricing models, and partner or compete with OTT players. Mobileum offers solutions to tackle the complexity and interoperability issues associated with legacy technologies, especially in roaming, when two networks and interconnecting parties are involved.
Mobileum’s VoLTE roaming testing solution guarantees your VoLTE subscribers the same supplementary voice services as they expect in traditional 2G/3G networks, e.g. call waiting, call hold etc. It allows stack adaptation and automated periodic testing to ensure QoS & QoE by monitoring performance issues real-time. Our testing scenarios verify:
❖ VoLTE/RCS/SMSoIP basic access
❖ Voice quality with VoLTE
❖ SMS and RCS performance
❖ SSoIMS functionality
Reporting, monitoring, and troubleshooting using essential VoLTE KPIs
Mobileum’s Reporting Engine provides several options for visualizing VoLTE KPIs that cover service availability (success rates), call establishment durations, and voice quality measurements. All test VoLTE cases provide a set of KPIs, which include:
❖ IMS Registration Duration
❖ PCSCF discovery/used address
❖ No. of Registration Requests
❖ QCI (default and dedicated bearers)
❖ SIP KPIs: Invite duration, Trying to Ring duration, end-to-end session establishment duration, session duration❖ RTP KPIs: Jitter (Avg, Max), Data Rate, Packet Loss, no. of packets dropped
❖ Voice Quality (POLQA)
❖ Offered/used codecs
❖ L3 KPIs: EPS bearer activation duration, QCI (default, dedicated bearer), AMBR for used APN, GBR/MBR (default, dedicated bearer)
Video over LTE (ViLTE) Testing
ViLTE leverages the operators’ IMS infrastructure to offer conversational video services over LTE.
Mobileum’s ViLTE testing follows the GSMA IR.94 guidelines supporting dedicated bearers for video and audio streams with supported codecs: H.264 (CBP Level 1.2) for video and AMR-WB for audio. It allows operators to periodically monitors video services with important KPIS:
❖ Voice/Video quality provided with POLQA and PEVQ
❖ GBR/NGBR bearer for video
❖ SIP related KPIs, e.g. call establishment duration, trying to ring duration
❖ RTP related KPIs, e.g. RTP packet loss, RTP jitter, RTP data rate
❖ Audio/Video codec used
❖ Audio/Video MOS
VoWiFi is one of the latest IMS-based services to be launched by mobile operators. It allows users to make voice calls using the data connection from any WiFi access point (untrusted non-3GPP access). The access technology, which is not controlled by the operator, adds another layer of complexity in providing adequate quality of service. Mobileum's VoWiFi testing solution allows operator to verify and periodically monitor the quality of the service. Our approach uses wireless modules as a flexible and robust solution for end-to-end VoWiFi measurements. It allows untrusted non-3GPP access and supports standard methods for WLAN authentication, e.g. WPA2 PSK. It uses EAP-AKA authentication for the IPSec tunnel between UE and ePDG.Like VoLTE, the transition to LTE meant that a new mechanism for delivering SMS was required. SMS over IP (SMSoIP) allows users to send or receive traditional SMS messages, while connected to LTE. 
As with VoLTE, Mobileum offers solution for testing and monitoring SMSoIP. Tests scenarios include MO_MT, to/from 2G/3G, and to/from External services, and use two approaches:
❖ SMSoIP testing on LTE wireless modules, a flexible and robust solution for end-to-end SMS over IP measurements, allowing full control of the IMS stack and associated messages.
❖ SMSoIP testing on S1 Core NW interface, an alternative approach for high volume testing that eliminates the radio access leg to isolate faults and provides in depth analysis using detailed traces.
SMS over WiFi (SMSoWiFi) Testing
SMS remains an important service for mobile operators, despite stiff competition from OTT messaging. With the introduction of VoWiFi, operators included support for SMS messages over WLAN access. SMS over WiFi (SMSoWiFi) allows users to send or receive traditional SMS messages, while connected to a WLAN access point.
Mobileum’s SMSoWiFi testing is a complete solution to monitor SMS over WLAN modules and offers several options to test different scenarios:
❖ SMSoWiFi_MO_MT
❖ SMSoWiFi to/from 2G/3G
❖ SMSoWiFi to/from SMSoIP (VoLTE)
Rich Communication Suite (RCSe) Testing
RCSe is a platform that offer various services, e.g. instant messaging, using the IMS infrastructure. It enables operators to compete with similar OTT services ensuring a high level of quality. 
Mobileum’s RCSe testing uses data capable modules and Mobileum RCS v.5.1 client. It can test the following features: Auto configuration, capability discovery, file transfer, IM and video share. The client is capable of auto configuration via Ut interface and IMS registration. Furthermore, root cause and troubleshooting of the RCS-e infrastructure can be observed via the protocol dialogues (SIP, HTTP(S), XCAP, MSRP) that are available as a.pcap result file in each test case iteration.
We offer RCSe core testing for:
❖ QoE, with Joyn App testing on a real smartphone (Samsung Galaxy)
❖ QoS, with Mobileum RCS-e client on a robust wireless module
Monetize the Investments in Telecom Network Infrastructure
Building a reliable network that can support all of the new services demanded by today’s subscribers can be challenging without the right tools. Mobileum’s Test Factory ensures that the quality of service (QoS) between service delivery and customer expectations is always in alignment. Whether it’s caring for VIP customers addressing fault management, or reducing the costs associated with customer care, CSPs are empowered to address concerns proactively. With Test Factory, CSPs can run continuous voice, data, and SMS roaming tests over any technology - 2G/3G/4G/VoLTE/SIP/GTP - to safeguard QoS and ROI.
