Siemens - Voice over IP (VoIP) Solutions

One of these applications benefit most from the cost reduction path that is a long distance phone service. If previous switching technologies mainly based on circuit-switched TDM makes call charges very high prices nowadays, voice over IP technology (VoIP) has helped reduce the price of this service to be true.
A call from Vietnam to America just lost almost freight rates for local, long-distance calls from a Hanoi to HCMC absolutely no cost is the vivid expression of this benefit.
However, the calls over IP networks using packet switching also certain challenges compared to traditional forms of communication such as voice quality is lower, there may be delays, echoes or security threatened threatening.
The switchboard products of Siemens phones which were rated very high in Vietnam market as well as globally is the choice of most businesses want to invest an advanced communication system, information reliable, stable and cost-effective and optimized.
HiPath PBX product range with models from a few dozen subscribers (users) to hundreds of thousands of subscribers, consistent with the needs of businesses small to large, to both service providers professional phone.

Model Connection
In fact, depending on investment conditions, the needs of each enterprise that the models may vary. A general model connects VoIP network components is shown in the image below.

VoIP networking model

At the main center
In the main centers, depending possibilities of investment, service levels and capacity requirements necessary may choose to use the HiPath 4000 or HiPath PBX HiPath 4000 and HiPath 3000. 3000 has the ability to support many types of terminals as conventional analog phones, phone number, IP telephone, softphone, fax machines ... The trunk of postal be connected to the HiPath (3000 or 4000) through the trunk cards. The system is capable of supporting analog trunks, digital (ISDN S2, PCM30, S0 ISDN) or IP trunks. HiPath systems also have the ability to connect to the service provider voice over Internet (ITSP) as NetNam, Saigon Postel ... Use of the service provider will allow the users to carry out office international calls at very cheap price

Branches
At the branch, there are two options when deploying telephone service:
- The branch is equipped with a separate system and HiPath 3000 is linked to major centers via IP network
- The branch uses the IP phone and connected to the HiPath system over the network at the IP Center
The first solution requires investment in the branch a separate system HiPath 3000, with subscriber interface / trunking complete. With this configuration, the branch subscribers can make calls to the public network of branches which through its trunk and ZIP call center / other branches via IP networks. This solution is suitable for branch has the number of users (subscribers) on 10 people and not in the same province / city center.
The second solution requires no additional equipment HiPath 3000 system separate branch. The calls to the public network will be routed first to the center through the IP network, then the Centre occupies the main trunk to connect to the public network of post office. This solution is suitable for the branch under 10 users and often a sales office or representative in the same province / city and main center.

Mobile work beyond the office
The staff working in the office (at home, on business trip outside) can take advantage of the Internet connection on the main center and use the software installed on a computer or PDA to make and receive calls. Meanwhile, users are seen as sitting in the office, can receive calls of colleagues, make calls to or receive calls from customers.

Requirements for infrastructure
Solutions can provide service quality almost equal to the quality of traditional voice services, but also the network infrastructure requirements well enough to be able to bring the best conversation quality
The bandwidth required for each IP voice channels via WAN connections depending codec (codec) voice. Naturally, the better voice quality requires higher bandwidth. With the use of standardized coding best quality G.711 bandwidth requirements for each call is 64Kbps. In other cases, use standard encryption when lower quality connection or insufficient to meet priority needs for other services. The standard can be used are:
- G.723.1 (5.3 / 6.4 Kbps)
- G.729a, G.729AB (8 Kbps)
Currently, data rates in Vietnam for WAN services like VDC MegaWAN pretty good quality with reasonable costs, enabling the deployment of these services easily.

Services used
The first users have full functionality of the system such as HiPath provide not link the network together: call forwarding, lift the machine protection, ring groups, call hold, call waiting, call out, internal call ... (please refer to the product documentation corresponding HiPath 4000/3000)
Internal call between branch
The phones of staff between branches or main center can make calls directly to each other by pressing the same extension number
These calls are considered local calls and no cost (external costs transmitted output - if any)
Call the public network
At the branch and main center, users can use the internal phone to call out to the public network. Setting call by dialing code outside accounting (0) and number needed to call outside.
With select the lowest cost routing (Least Cost Routing), the HiPath system will select services, service providers, user connection costs to ensure the lowest call. The system can automatically insert the header code like 171, 178, 177 to determine the long-distance calls to save on costs.
In the case of calls to the public network at branch HiPath system, the first call is routed over IP networks (for free) to the HiPath system's last branch, then occupied trunk postal branch there to make calls out. Thus, long-distance calls to pay the cost of local calls.
Storage systems
Depending on investor demand, the need for expansion in the future customers can choose the pattern and scale of investment is suitable for a range of products varies from system to services and facilities terminal.
- HiPath 8000: supports up to 100,000 subscribers per system, in accordance with the model home phone service provider
- HiPath 4000: support up to 12,000 subscribers in accordance with the large and very large companies, multi-national companies
- HiPath 3000: support up to 500 subscribers per system, consistent with the medium and small enterprises. In addition, the small model of the HiPath 3550 HiPath 3000 as allow more cost savings initial investment with the ability to support more than 100 subscribers, in accordance with the branch and small offices.

Benefits of the solution
VoIP solutions today increasingly being used extensively by the practical benefits:
- Allow reduce operating costs, such as telephone charges, the cost of management and maintenance: only a common infrastructure for services and applications, central management system allows minimizing expenses labor, travel expenses.
- Application and centralized management: applications come with the phone system, such as contact center, call recording, voicemail applications and phones may only be deployed at the main center, save investment costs. Besides the installation, configuration and authorization, user management is also centralized management.
- Investments reasonable and are conserved: Enables deployment from a few dozen to thousands or even hundreds of thousands of subscribers. The expansion of the upgrade is done through the addition of activated copyright and interface card (if applicable), the client does not need to invest in new systems when system capacity allows
- Increase work efficiency: The service features a user, the ability to integrate computer applications allow to take advantage of information resources, increase productivity, accelerate decision-making processes, increase business efficiency.

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