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VoLTE billing architecture explained
Charging is an important aspect for VoLTE calls and a must for commercial deployment— but it literally pays to get it right. As the same session flows through PGW in LTE network and IMS core there is...
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PSTN subscriber to IMS subscriber call flow
IP Multimedia Subsystem is the new IP based signaling system for setting up multimedia sessions. We have already covered the call flow for an IMS subscriber calling another IMS subscriber. Here we will...
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WebRTC: a double-edged sword for mobile operators!
The world is never going to look the same for the mobile industry. After three decades of an effectively closed service environment, everything but the bit pipe is now up for grabs. With the rise of...
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World’s First End-to-End VoTD-LTE Call
ZTE Corporation completes the world’s first end-to-end voice-over TD-LTE (VoTD-LTE) call in partnership with China Mobile and Marvell Technology Group. The VoTD-LTE call was conducted on China Mobile’s...
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Envisioning a Software Defined IP Multimedia System (SD-IMS)
This post takes this idea a logical step forward and proposes a Software Defined IP Multimedia System (SD-IMS). In today’s world of scorching technological pace, static configurations for IT...
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The Case for VoLTE
Despite the introduction of LTE with its heavy focus on improved mobile broadband speeds, mobile operators still rely on voice and SMS services for a large part of their revenues (roughly 70%...
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VoLTE Roaming with RAVEL (Roaming Architecture for Voice over IMS with Local...
Voice over LTE or VoLTE has many problems to solve. One of the issues that did not have a clear solution initially was Roaming. iBasis has a whitepaper on this topic here, from which the above picture...
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Telephony – Telco service or Internet application?
When comparing different forms of VoIP, one risk comparing “apples and oranges”. Broadly speaking, we can divide VoIP into two main categories. First, the service can be implemented as a faithful...
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LTE-A Pro for Public Safety Services – Part 1
In October 2015, 3GPP has decided to refer to LTE Release 13 and beyond as LTE-Advanced Pro to point out that LTE specifications have been enhanced to address new markets with special requirements such...
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LTE Femto Gateway with X2 Broker
An LTE femtocell* (HeNB) is an ultra-small cellular base station that connects to a mobile operator’s LTE core network via broadband Internet. Using this femtocell, a mobile operator can eliminate...
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