Huawei B2268H Router Manual PDF (Setup & Configuration Guide)

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LTE TDD B2268H

User Guide

13 VoIP

Issue 01 (2014-01-15)

109

Figure 13-8

SIP Redirect Server

----End

SIP Register Server

A SIP register server maintains a database of SIP identity-to-IP address (or domain name)

mapping. The register server checks your user name and password when you register.

RTP

When you make a VoIP call using SIP, the RTP (Real time Transport Protocol) is used to handle

voice data transfer. See RFC 3550 for details on RTP.

Pulse Code Modulation

Pulse Code Modulation (PCM) measures analog signal amplitudes at regular time intervals and

converts them into bits.

SIP Call Progression

The following figures displays the basic steps in the setup and tear down of a SIP call. A calls B.

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LTE TDD B2268H

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Issue 01 (2014-01-15)

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Figure 13-9

SIP Call Progression

Step 1

A sends a SIP INVITE request to B. This message is an invitation for B to participate in a SIP

telephone call.

Step 2

B sends a response indicating that the telephone is ringing.

Step 3

B sends an OK response after the call is answered.

Step 4

A then sends an ACK message to acknowledge that B has answered the call.

Step 5

Now A and B exchange voice media (talk).

Step 6

After talking, A hangs up and sends a BYE request.

Step 7

B replies with an OK response confirming receipt of the BYE request and the call is terminated.

----End

Voice Coding

A codec (coder/decoder) codes analog voice signals into digital signals and decodes the digital

signals back into analog voice signals. The LTE Device supports the following codecs.



G.711 is a Pulse Code Modulation (PCM) waveform codec. PCM measures analog signal

amplitudes at regular time intervals and converts them into digital samples. G.711

provides very good sound quality but requires 64 kbps of bandwidth.



G.726 is an Adaptive Differential PCM (ADPCM) waveform codec that uses a lower

bitrate than standard PCM conversion. ADPCM converts analog audio into digital signals

based on the difference between each audio sample and a prediction based on previous

samples. The more similar the audio sample is to the prediction, the less space needed to

describe it. G.726 operates at 16, 24, 32 or 40 kbps.



G.729 is an Analysis-by-Synthesis (AbS) hybrid waveform codec that uses a filter based

on information about how the human vocal tract produces sounds. G.729 provides good

sound quality and reduces the required bandwidth to 8 kbps.

MWI (Message Waiting Indication)

Enable Message Waiting Indication (MWI) enables your phone to give you a message

–

waiting

(beeping) dial tone when you have a voice message(s). Your VoIP service provider must have a

messaging system that sends message waiting status SIP packets as defined in RFC 3842.

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13.6.3 Quality of Service (QoS)

Quality of Service (QoS) refers to both a network's ability to deliver data with minimum delay,

and the networking methods used to provide bandwidth for real-time multimedia applications.

Type of Service (ToS)

Network traffic can be classified by setting the ToS (Type of Service) values at the data source

(for example, at the LTE Device) so a server can decide the best method of delivery, that is the

least cost, fastest route and so on.

DiffServ

DiffServ is a class of service (CoS) model that marks packets so that they receive specific per-

hop treatment at DiffServ-compliant network devices along the route based on the application

types and traffic flow. Packets are marked with DiffServ Code Points (DSCP) indicating the

level of service desired. This allows the intermediary DiffServ-compliant network devices to

handle the packets differently depending on the code points without the need to negotiate paths

or remember state information for every flow. In addition, applications do not have to request a

particular service or give advanced notice of where the traffic is going.3

DSCP and Per-Hop Behavior

DiffServ defines a new DS (Differentiated Services) field to replace the Type of Service (TOS)

field in the IP header. The DS field contains a 2-bit unused field and a 6-bit DSCP field which

can define up to 64 service levels. The following figure illustrates the DS field.

DSCP is backward compatible with the three precedence bits in the ToS octet so that non-

DiffServ compliant, ToS-enabled network device will not conflict with the DSCP mapping.

Figure 13-10

DiffServ: Differentiated Service Field

The LTE Device does not support DiffServ at the time of writing.

The DSCP value determines the forwarding behavior, the PHB (Per-Hop Behavior), that each

packet gets across the DiffServ network. Based on the marking rule, different kinds of traffic

can be marked for different priorities of forwarding. Resources can then be allocated according

to the DSCP values and the configured policies.

13.6.4 Phone Services Overview

Supplementary services such as call hold, call waiting, and call transfer. are generally available

from your VoIP service provider. The LTE Device supports the following services:



Call Hold



Call Waiting



Making a Second Call

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

Call Transfer



Three-Way Conference



Do not Disturb

To take full advantage of the supplementary phone services available through the LTE Device's phone

ports, you may need to subscribe to the services from your VoIP service provider.

The Flash Key

Flashing means to press the hook for a short period of time (a few hundred milliseconds) before

releasing it. On newer telephones, there should be a "flash" key (button) that generates the

signal electronically. If the flash key is not available, you can tap (press and immediately

release) the hook by hand to achieve the same effect. However, using the flash key is preferred

since the timing is much more precise. With manual tapping, if the duration is too long, it may

be interpreted as hanging up by the LTE Device.

You can invoke all the supplementary services by using the flash key.

Europe Type Supplementary Phone Services

This section describes how to use supplementary phone services with the

Europe Type Call

Service Mode

. Commands for supplementary services are listed in the table below.

After pressing the flash key, if you do not issue the sub-command before the default sub-

command time-out (2 seconds) expires or issue an invalid sub-command, the current operation

will be aborted.

Table 13-6

European Flash Key Commands

COMMAN

D

SUB- COMMAND

DESCRIPTION

Flash

NA

Put a current call on hold to place a second call.

Switch back to the call (if there is no second call).

Flash

0

Drop the call presently on hold or reject an incoming

call which is waiting for answer.

Flash

1

Disconnect the current phone connection and answer

the incoming call or resume with caller presently on

hold.

Flash

2

1. Switch back and forth between two calls.

2. Put a current call on hold to answer an incoming

call.

3. Separate the current three-way conference call into

two individual calls (one is on-line, the other is on

hold).

Flash

3

Create three-way conference connection.

Flash

*98#

Transfer the call to another phone.

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European Call Hold

Call hold allows you to put a call (

A

) on hold by pressing the flash key.

If you have another call, press the flash key and then "2" to switch back and forth between caller

A

and

B

by putting either one on hold.

Press the flash key and then "0" to disconnect the call presently on hold and keep the current

call on line.

Press the flash key and then "1" to disconnect the current call and resume the call on hold. If you

hang up the phone but a caller is still on hold, there will be a remind ring.

European Call Waiting

This allows you to place a call on hold while you answer another incoming call on the same

telephone (directory) number.

If there is a second call to a telephone number, you will hear a call waiting tone. Take one of the

following actions.



Reject the second call.

Press the flash key and then press "0".



Disconnect the first call and answer the second call.

Either press the flash key and press "1", or just hang up the phone and then answer the phone

after it rings.



Put the first call on hold and answer the second call.

Press the flash key and then "2".

European Call Transfer

Do the following to transfer a call (that you have answered) to another phone number.

Step 1

Press the flash key to put the caller on hold.

Step 2

When you hear the dial tone, dial "*98#" followed by the number to which you want to transfer

the call. to operate the Intercom.

Step 3

After you hear the ring signal or the second party answers it, hang up the phone.

----End

European Three-Way Conference

Use the following steps to make three-way conference calls.

Step 1

When you are on the phone talking to someone, press the flash key to put the call on hold and

get a dial tone.

Step 2

Dial a phone number directly to make another call.

Step 3

When the second call is answered, press the flash key and press "3" to create a three-way

conversation.

Step 4

Hang up the phone to drop the connection.

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