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What to do if my Cisco 8851 IP Phone displays an "Initialising Network" message constantly?
Check the connection from the handset to the router or switch to ensure it's receiving a signal. Swap out Cat 5 cables and check ports, as well as connections on all wires. Also, plug the handset into a different port that you know definitely works.
Why Cisco IP Phone cannot connect to another Cisco IP Phone?
Cisco does not support connecting one IP phone to another through the PC port. Each IP Phone should connect directly to a switch port. Phones connected in a line using the PC port will not work.
What to do if my Cisco 8851 handset shows an on-screen extension but has an amber light?
First, ensure all router port settings have been implemented, paying special attention to port 5060 and ensuring SIP ALG is disabled. Next, eliminate LAN variables by plugging the handset directly into the router. If your router doesn't provide power over Ethernet, ensure the only thing between the router and the handset is the Power Over Ethernet switch, and that all wires and units function correctly. Also, verify the handset is still assigned to a user on the Horizon Portal. Finally, try plugging the handset into a different port that you know works.
What to do if my Cisco 8851 IP Phone handset boots up with an amber light and no extension?
First, ensure all router port settings have been implemented, especially on port 5060, and make sure that SIP ALG is disabled. Check that you've assigned a local IP address by looking it up on the router's ARP cache. Eliminate LAN variables by plugging the handset directly into the router. If your router doesn't provide power over Ethernet, make sure the only thing between the router and the handset is the Power Over Ethernet switch and that all the wires and units are working correctly. Make sure the handset is still assigned to a user on the Horizon Portal. Finally, try plugging the handset into a different port that you know works.
What happens if I move a network connection from Cisco 8851 to a workstation?
If your Cisco IP phone receives power through the network connection, exercise caution when moving the network connection from the phone to a desktop computer. The computer's network card cannot receive power through the network connection. If power is supplied through the connection, the network card may be damaged. To prevent damage, wait at least 10 seconds after unplugging the cable from the phone before plugging it into the computer. This delay allows the switch to recognize that a phone is no longer connected and to stop providing power to the cable.
What to do if there is a codec mismatch between Cisco 8851 IP Phone and another device?
Check the RxType and TxType statistics to see the codec used for the conversation between your Cisco IP Phone and the other device. The values should match. If they don't, verify that the other device can handle the codec conversation, or ensure that a transcoder is in place to handle the service.
What causes loopback condition on Cisco 8851 IP Phone?
A loopback condition can occur under these circumstances: 1. The SW Port Configuration option in the Network Configuration menu on the phone is set to 10 Half (10-BaseT/half duplex). 2. The phone receives power from an external power supply. 3. The phone is powered down (the power supply is disconnected). In this case, the switch port on the phone can become disabled, and the message HALF_DUX_COLLISION_EXCEED_THRESHOLD appears in the switch console log. To resolve this, reenable the port from the switch.
General| Resolution | 800 x 480 pixels |
|---|---|
| Network Interfaces | Dual Gigabit Ethernet ports |
| Headset Port | Yes |
| Audio | Wideband audio |
| Ethernet | 10/100/1000 Mbps |
| USB | Yes, USB 2.0 |
| Power | IEEE 802.3af/at Power over Ethernet (PoE) |
| Protocols | SIP |
| PoE | Yes |
| Codec Support | G.711, G.722, G.729, iLBC |
| Headset Connector | RJ9 |
| Lines | Up to 5 lines |
| Dimensions | 229 x 256 x 41 mm (excluding foot stand) |
| Weight | 1.2 kg |
Overview of attributes for the Cisco IP Phone 8811 model.
Overview of attributes for the Cisco IP Phone 8841 model.
Overview of attributes for the Cisco IP Phone 8845 model.
Overview of attributes for the Cisco IP Phone 8851 and 8851NR models.
Overview of attributes for the Cisco IP Phone 8861 model.
Overview of attributes for the Cisco IP Phone 8865 model.
Instructions on connecting the Cisco IP Phone 8865 to the network.
Instructions for initiating calls, including predialing and using speakerphone/headset.
How to answer the oldest available call, including priority over held calls.
Ways to answer a ringing coworker's call by redirecting it to your phone.
How to handle a new call while already on another call.
Procedure for redirecting a connected call to another phone number.
How to forward calls to another number, including unconditional and conditional forwarding.
Methods for temporarily storing a call to retrieve it later from another phone.
Accessing and searching the corporate contact directory.
Procedure for searching for and dialing contacts from the corporate directory.
How to place a call directly from an entry in the call history.
Procedure for accessing the voicemail system.
Ways to check for new voice messages using phone indicators.
How to listen to voice messages after accessing the voicemail system.
How to talk simultaneously with multiple parties in an ad hoc meeting.
Using speed dial buttons and codes to place calls quickly.
Configuring a different Cisco IP Phone as your own temporarily.
Handling calls associated with your desk phone number using your mobile phone.
Pairing your mobile device to use its line through your Cisco IP Phone.
Securely connecting to the corporate network from off-site locations.
Procedure to configure phone settings for VPN access.
Instructions for mounting the Cisco Unified Video Camera on a phone or monitor.
Using Bluetooth headsets with Cisco IP Phones, including pairing and features.
Details about the Key Expansion Module and its compatibility.
Troubleshooting the sign-in window not appearing for remote access.
Resolving 'Security Error' messages indicating internal firmware issues.
Using the Quality Reporting Tool (QRT) to report and troubleshoot phone issues.
General safety and performance guidelines for the Cisco IP Phone.
Compliance statements required by the Federal Communications Commission.
Special terms applying to hardware warranty and services during the warranty period.
