- Telephone industries of Pakistan, Haripur 
  - Heavy Mechanical Complex, Taxila 
  - Advance Engineering Research Organization (AERO), Hassanabdal 
  - Efficient Technical Support Services (Pvt.) Ltd. Islamabad 
  - Carrier Telephone Industries (Pvt.) Ltd. Islamabad 
  - Telecom Foundation, Islamabad 
  - Alcatel Pakistan (Pvt.) Ltd. Islamabad 
  - Comcept (Pvt.) Ltd. Islamabad 
  - Electro Control Industries (Pvt.) Ltd. Islamabad 
  - Industrial Tecnology (Pvt.) Ltd. Islamabad 
  - NDC, Islamabad 
  - Dynamic International Technologies, Rawalpindi 
  - East West Infiniti (Pvt.) Ltd. Islamabad 
  - Zhongxing Telecom Pakistan (Pvt.) Ltd. (ZTE) 
  - Siemens Pakistan (Pvt.) Ltd. Islamabad 
  - Apollo Telecom (Pvt.) Ltd. Islamabad