370755
The company also provides operations support services , including operations , enterprise solutions , middleware , custom operational support systems OSS / BSS applications , and environment configuration support services ; infrastructure management services , such as network and system management , enterprise security management , VoIP and IP telephony , help desk , and data center operation services ; engineering services , including interactive applications , test labs for device testing , and hand held devices application , device certification , and provisioning stack services ; and quality assurance and testing services .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None