SIP Proxy Setup

SIP URL

(on the first line, just enter your extension number, when it is complete, the sip url for your phone should be:
"123"@yourdomain.com:5060, assuming the extension for this phone is 123, as you fill out the fields, it should update the SIP: field properly.

SIP : 123 "123"@yourdomain.com:5060

SIP Proxy: yourdomain.com
SIP Proxy Port: 5060
Registrar Address: yourdomain.com
Registrar Port: 5060
Expiry Time(sec.): 3600
Session Timer: 0
Display Name: "your display name"
SIP Format: X Normal O Drop Port XDrop 5060 Port (Normal should be shosen)

STUN Proxy Setup

STUN : X Disable O Enable (Disable should be chosen)
STUN Address:
STUN Port:

Outbound Proxy Setup

Outbound Proxy: sipx.yourdomain.com (your sipx FQHN)
Outbound Proxy Port: 5060

Authtication (this is not a typo by me, this is what Linksys displays)

Registrar Name: 123 (your extension)
Password: 123 (your sip password)

APPLY/SAVE and CLICK ON SDP SETTINGS

Payload: G.711u-G.711a-G.729
Packet Time: X Small O Large (Small should be chosen)
DTMF Relay: ENABLE
UDP Port: 5060
RTP Port: 2070

APPLY/SAVE