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What is a SIP phone VoIP Supply

Lot of 35 polycom ip 550, 560, & 650 sip hd poe voip business display phones 24- 550 with handsets and stands. 10-650 With Handsets and Stands. This Equipment is Used, Working and in Good Condition. This Listing is for Lot of 35 Polycom IP 550, 560, & 650 SIP VoIP Small Business Display Phones.