Equipped with a single-pole, single-throw switch, the push-to-talk (PTT) handset completes the total package for secure conversations. The Cisco IP Network coupled with Clarity's Walker PTT handset, alleviates the need to worry about compromised conversations and is hearing aid compatible. The WS-2620 is compatible with all 7900 Series phones (excluding the 7920). The coiled handset cord for use with Cisco phones is available separately (order item # 51309.024).