MMTel AS in IMS Network
MMTel AS refers to "Multimedia Telephony Application Server". It is an application server in the IMS network.
The MMTel is responsible for providing wide range of services for the UEs including 'supplementary services', such as call waiting, call forwarding, call hold, ...
In addition, it collects and reports charging information related to telephony services to the appropriate billing systems.
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VoLTE (Voice over LTE) Introduction
While the UE attached to LTE network, the UE can initiate, or receive a voice or a video call. The UE achieves this, by connecting to an external network, which is the 'IMS' network. We can call this, Voice over LTE (VoLTE). This is exactly like when you would like to create a call, while…
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What is an ‘EPS Bearer’ in LTE ?
During 'LTE attach' procedure, the network establishes this EPS Bearer between the UE and the PGW. The PGW assigns an IP address for this Bearer. The UE uses this IP address, in order to communicate with the PDN. In addition, the PGW assigns a QoS for this Bearer, which guarantees the QoS for the data…
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