4389
Schulzrinne co-designed the Session Initiation Protocol along with Professor Mark Handley , the Real Time Streaming Protocol , the Real-time Transport Protocol , the General Internet Signaling Transport Protocol , part of the Next Steps in Signaling protocol suite .
 person: Schulzrinne; person: Professor Mark Handley; organization: Internet
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Schulzrinne; person: Professor Mark Handley; organization: Internet