We found 4 dictionaries that define the word Internet Telephony Service Providers:

General (1 matching dictionary)

1. Internet Telephony Service Providers: Dictionary.com

Computing (2 matching dictionaries)

2. Internet Telephony Service Providers: Free On-line Dictionary of Computing
3. Internet Telephony Service Providers: Encyclopedia

Medicine (1 matching dictionary)

4. online medical dictionary (No longer online)

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