Cisco SPA 303 Package Contents Manual page 4

5. Click [Phone] tab.
5. Click [EXT 1] tab.
Set the following:
Voicemail Number: 999
Line Key 1: Extension – 1
Short Name: XXXXX
Line Key 2: Extension – Disable
Line key 3: Extension – Disable
* Click [Submit] to save all changes.
Set the following:
NAT Keep Alive Msg: Blank
NAT Keep Alive Enable: Yes
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