93583
A Telephone VoIP Adapter ( or TVA ) is a device that allows traditional digital PBX ( Private branch exchange ) telephone handsets e.g. Nortel Meridian & BCM or Siemens Optiset/Optpoint , to be connected to a VoIP network , using , for example , SIP ( Session initiation protocol ) .
 Nortel, Siemens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nortel, Siemens