VoIP (Voice over Internet Protocol) is a technology that transmits audio to the Internet. Currently, VoIP technology is replacing the analog phone which provides ease of use and management. While Srinakharinwirot University installed and used analog phones for more than 20 years. Functions and features are limited that cannot be extended Including the device of the phone system has a long service life, deteriorate, and lack replacement equipment from the product owner, combined with higher maintenance costs. SWU therefore needs to adjust the analog phone to a VoIP phone system to fix the limitations of analog phones. VoIP telephone system has features that are easy to manage, install, move and have low cost.
At present, Srinakharinwirot University has developed ICT information technology system in infrastructure which is covering all areas, such as SWU Prasanmitr and Ongkharak, Panyananthaphikkhu Chonprathan Medical Center and Bodhivijjalaya College, Sa Kaeo Province, which the internet network infrastructure is the heart of VoIP since UTP cable that connected to the computer (PC) has been used in conjunction with the VoIP phone which is sharing resources and helps to save the cost of analog telephone line signals
VoIP phone jack is controlled from the central device, is IP PBX via LAN and internet, which is different from the analog phone jacks that have more complicated steps than the VoIP phone system. At the same time, analog phones require a lot of equipment that make the management process, maintenance and higher costs as well.
VoIP phone system has an advantage of resource sharing and ease of management, but there are disadvantages in the electrical system, LAN and internet network due to all 3 factors, if there is a problem, there will be an immediate impact on the VoIP phone system.
In addition to the advantages of transmitting audio on LAN networks and internet networks with the VoIP phone jack, VoIP can also install software on a computer called Softphone instead of using a VoIP phone jack as well, and currently has developed for mobile devices or smartphone can communicate VoIP via the internet as well. Based on the above information, therefore, Srinakharinwirot University has chosen to use the VoIP phone system.
Comparison table of the phone system between VoIP and Analog
| Telephone features |
VoIP phone system |
Analog phone system |
| General usage characteristics |
- Transferred
- Received
- Pulled
- Hold
- Hang up
- Show number
- Show missed call number
- Face-to-face conversation (Only machines with screen or sip phone program)
|
- Transferred
- Received
- Pulled
- Hold
- Hang up
|
| Equipment used |
- VoIP phone
- UTP that connected to the internet network
- IP PBX with license (phone number)
|
- Analog phone
- Telephone line (RJ11)
- Main Distribution Frame (MDF) for buildings
- Line card or Extension installed in Private Branch Exchange (PBX)
- Telephone exchange cabinet (Control node or peripheral node)
|
| Moving/relocating telephone number |
- The destination has a UTP connecting to the internet
- Change the number of VoIP phone jack and IP PBX
|
- The destination has a telephone line (RJ11) connected to PBX
- Line card must have enough channels.
- Change the telephone number at PBX and telephone exchange cabinet.
|
| Increasing the number |
- Add license at IP PBX (No need to buy additional equipment)
|
- PBX and telephone exchange cabinets must have support channels.
- If the channel is full, need to purchase additional telephone line equipment which can support from 16 numbers onwards
|
| Phone usage pattern |
- VoIP phone jack
- Softphone installed on the computer
- Softphone installed on the smartphone
|
|
| Limitation |
- If the internet system or electricity has trouble, you will not be able to use the VoIP phone system.
|
- If the electrical system has trouble, you are still able to use analog phones as usual (Can use the phone only in the same building network)
- If any channel on the line device is damaged, it cannot be repaired. You need to buy a new phone line device to replace the original.
|
Contact channel
Because the Computer Center has cooperated with the Physical Development Center for providing VoIP service
- The computer center is the system administrator controlling the central functions of VoIP, connection between Prasanmitr and Ongkharak, and the university's IVR.
- Physical Development Center Is a service provider for telephone users in the installation, repairing, including the issuance of telephone numbers to the department.
Contact channel
- The phone has trouble.
Contact http://dbts.swu.ac.th/submit/madbts2014/default.asp
- SWU’s IVR announcement
Contact to Information and Public Relations Center. Tel. 02-6495000 ext. 0
- To ask for advice on installing VoIP phones
Contact E-mail: voip@swu.ac.th
Telephone system diagram
