Model Number: QX-502 Brand Name: Cosun Key Specifications/Special Features: Phone features Vxworks OS Supports SIP2.0 (RFC3261) and correlative RFCs SIP supports 2 SIP servers, and backup SIP proxy servers Supports SIP UDP/TCP/TLS SIP supports SIP domain, SIP authentication (none, basic, MD5), DNS name of server, Peer to Peer/IP CallDisplay Display resolution: 128x48Key features Large dot matrix LCD display and soft keys make user easier to use
Soft keys programmable
Supports RJ-9 headset
Multi languages displayed

Advanced features
Call forwarding (busy/no answer/always)
Call transfer (unattended/attended/semi-attended)
Call holding
Call waiting
3 way call conference
Capable of 10-way conversation
BLF list
Join call
Call pickup
Call park
Redial
Call back
Call completion
Hot desking
Auto redial
Predial
SIP messaging, MWI
Flexible dial plan
Barring function for outgoing calls
Call logs with missed calls/incoming calls/outgoing calls. Each supports 300 records
Phonebook 500 records
Speed dial (abbreviateddialing)
Hotline/warm-line
Call rejection
Black list/white list
Intercom/intercom barge
Password dial, DTMF hidden
Action URL/ active URI
Voice codec setting for each SIP line
Multicast
LDAP, XML phonebook
Web dial
Keypad lock, emergency call
Do not disturb
Auto answer
Caller ID display
CLIR(rejects anonymous calls)
CLIP(to make an anonymous call)
Dial without registration