ATL Telecom IP300S - Manual (Page 73)

IP SIP Phone v2 User’s Guide Mar. 2005
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11.4. Ear Phone
E a r P h o n e :
█ █ █ █ █ █ █ █ █
Activate when ear phone is on and the phone set is hooked off or while at least one call is
engaged. Use【Õ】and 【 Ö】keys to adjust volume.