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Challenges In Interoperability: Phone Numbers and VoIP

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Ruth Ungerer

on 21 September 2012

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Transcript of Challenges In Interoperability: Phone Numbers and VoIP

Santosh Joshi, Miriam Mwenja, and Ruth Ungerer

The University of Texas Health Science Center at Houston School of Biomedical Informatics

HIT5327 Standards and Standard Development in Applied Health Informatics

September 16, 2012

Professor Juliana Brixey Challenges in Interoperability:
Phone Numbers and VoIP What number do I call to get someone in Nepal? Call 977 1 4423524

977 Country of Nepal
1 Area in Nepal
44223524 Local No. in Nepal

CCC-A-LLLLLLL is the format (Davis, 2008)
C = Country Code
A= Area Code
E=Local Exchange
L=Line Number What number do I call to get someone in Nepal? What number do I call to get someone in Kenya? This is a cell phone number in Kenya that is provided by a Company known as Celtel: (011-254-733-554003)

Number Breakdown
001- International access code
254 – Represents country code (Kenya) .
733, 722 – Represents cell phone company ( Celtel, Safaricom)
554003 is the subscriber number

In Kenya cellphone companies do not have city codes rather they have company codes that represent them.
Government telecommunications provide landline services (home phones) have codes that represent different cities. 020(Nairobi) International Telecommunications Union (ITU-T)
(for Telecommunication Standardization Sector of the International Telecommunications Union) is the primary international body for fostering cooperative standards for telecommunications equipment and systems.(Group.itu.int, 2012)

Standardization of telephone number format: International code-> country code -> city/subscriber code –> local number.

Beyond the country code, there is no real standard. The best you can do is recognize, by the country code, which nation a particular phone number belongs to and deal with the rest of the number according to that nation's format.

Phone numbers are very difficult to code for and query in computer application. Interoperability of Phone Numbers? VoIP is a telephone service that uses the public Internet and private backbones for call transport (Your Dictionary, 2012).

A large number of devices can enable VoIP communication, some of which allow use of telephone devices to interface with IP networks (Packetizer, 2012).

The interoperability of VoIP depends on multiple functioning systems. Once the communication is underway one of the many software applications chosen to run VoIP will have to be working smoothly, the internet connection itself will have to be solid, connectivity across networks will have to be reliable, and finally, the receiving device on the other end of the call or videoconference will have to have all systems functioning optimally. This requires a symphony of devices to be ‘playing’ beautifully together. Interoperability of Voice over Internet Protocol (VoIP) Interoperability is the ability of two or more systems or components to exchange information and to use the information that has been exchanged (Benson, 2012, p. 21).

Making a phone call or using Voice Over Internet Protocol (VoIP) requires many layers of standards to insure reliability.The following slides illustrate the challenges and complexity of making a phone call, or using VoIP. Introduction Interoperability is difficult

Standards are necessary

An international phonecall requires standards to function across the globe.

VoIP requires layers of standards to achieve optimum functionality Summary Benson, T. (2012). Why interoperability is hard. In T. Benson (Ed.), Principles of
health interoperability HL7 and SNOMED (p.21). Springer-Verlag: London

Davis, A. (2008). Is there a standard for storing normalized phone numbers in a
database? Stackoverflow, [blog] 03 September, Retrieved from

Groups.itu.int (2012). Why do we need international standards in
telecommunications? - ITU-T - Standards Q&A - Frequently Asked Questions
- ITU-T General FAQs. Retrieved from http://groups.itu.int/itu-

Packetizer, (2012). Understanding VoIP: How does VoIP work?
Packetizer. Retrieved from
http://www.packetizer.com/ipmc/papers/understanding_voip/Thomas, D.

Your Dictionary, (2012). Retrieved from http://computer.yourdictionary.com/vo-ip References
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