• Polycom adapter cable for Electronic Hook Switch for Soundpoint IP 430 and above. 
• Suitable for SDW SDW 5066, SDW 5065, SDW 5036, SDW 5035, 5015, SDW 5016, DW Office, DW Office ML, DW Office Phone, DW Pro 1, DW Pro 1 ML, DW Pro 1 Phone, DW Pro 2, DW Pro 2 ML, DW Pro 2 Phone, SD Office, SD Office ML, SD Pro 1, SD Pro 1 ML, SD Pro 2, SD Pro 2 ML and D 10 Phone.
• Check your compatibility with your telephone
• Sennheiser old part# 504104 - EPOS new part# 1000750