HUAWEI E5172As-22 LTE CPE Product Description
Issue 03 (2013-06-08)
Commercial in Confidence
17
5
Voice Services
The E5172As-22 provides circuit switched voice services via the telephone line
interface with high speech quality.
5.1 CSFB
With circuit-switched fallback, when the E5172As-22 device is operating in LTE (data
connection) mode and a call comes in, the LTE network pages the device. The device
responds with a special service request message to the network, and the network
signals the device to move (fall back) to 2G/3G to accept the incoming call. Similarly
for outgoing calls, the same special service request is used to move the device to
2G/3G to place the outgoing call.
5.2 National Profiles
The E5172As-22 supports configure country specific settings for the telephony
services. This can be achieved by configuring on the Web UI.
5.3 Voice Codec
The E5172As-22 supports all GSM voice codec, Enhanced Full Rate (EFR), Full Rate
(FR), Half Rate (HR), and WCDMA Adaptive Multi-rate (AMR) codec.
5.4 General Telephone Features
The E5172As-22 supports E.164 numbering. E.164 numbers can have a maximum of
15 digits and are usually written with a + prefix.
There are two ways to indicate that the dialed number sequence is complete:
Dialing the EON (End of Number) key (e.g. #) immediately sends the call.
An Inter Digit Timer is used to check the dialing process, after this period, no
more digits are expected to arrive and an attempt to establish the call is done.
