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These release notes describe the known problems for the Cisco IP Phone 7960. You might need to notify your telephone users about some of the issues discussed in this document.
These release notes provide the following information:
Use these publications to learn how to install and use the Cisco IP Phone 7960:
Known problems are unexpected behaviors or defects in the Cisco IP Phone 7960. They are graded according to severity level. These release notes contain information for severity levels 1 and 2 only.
You can search for known problems on the Cisco bug tracking system tool, called Bug Navigator II. To access Bug Navigator II, do one of the following:
Table 1 describes restrictions or other known issues for the Cisco IP Phone 7960.
| Summary | Explanation |
|---|---|
Message waiting light does not work with non-Cisco voice mail systems | The message waiting light is not lit if you are using non-Cisco voice mail systems and Cisco CallManager is not configured correctly for that voice mail system. In these cases, the user must access the system to determine if there are any messages. |
Messages button does not work with non-Cisco voice mail systems | If you are using a Cisco voice mail system, the messages button retrieves the messages. For non-Cisco voice mail systems, you must access the voice mail system in order to retrieve messages. |
Services button does not work | The services button is not currently operational. Pressing the button does not perform any functions. |
Personal Directory and Corporate Directory options do not work | These options on the Directories menu are not operational. |
Daisy-chaining IP phones | Do not connect an IP phone to another IP phone through the access port. Each IP phone should be directly connected to a switch port. If you connect IP phones together in a line (daisy-chaining), a problem with one phone can affect all subsequent phones in the line. Also, the bandwidth is shared among all phones on the line. |
Voice quality when calling digital cell phones using the G.729 protocol | In Cisco CallManager, you can configure the network to use the G.729 protocol (the default is G.711). When using G.729, calls between an IP phone and a digital cellular phone will have poor voice quality. Only use G.729 when absolutely necessary. |
Prolonged broadcast storms cause IP phones to re-register | Prolonged broadcast storms (lasting several minutes) on the voice VLAN cause the IP phones to re-register with another Cisco CallManager server. |
Moving a network connection from the phone to a workstation | If you are powering your phone through the network connection, you must be careful if you decide to unplug the phone's network connection and plug the cable into a workstation. Workstation NICs cannot receive power through the network connection; if power comes through the connection, the NIC can be destroyed. To prevent this, wait 10 seconds or longer after unplugging the cable from the phone. This gives the switch enough time to recognize that there is no longer a phone on the line, and to stop providing power to the cable. |
Changing the telephone configuration | To change the telephone configuration, you must press **# and then the Settings button. |
Phone resetting | The phone resets when it looses contact with the Cisco CallManager software. This lost connection can be due to any network connectivity disruption, including cable breaks, switch outages, and switch reboots. |
LCD display issues | You might see Beat frequencies (scan lines) in the LCD if you are using certain types of old florescent lights in your building. Moving the phone from the lights, or replacing the lights, should resolve the problem. |
DMTF delay | When you are on a call that requires keypad input, if you press the keys too quickly, some keys might not be recognized. |
Powering the IP phone from multiple sources | An IP phone can be powered from a wall socket, from a switch port, or from a power-source between the phone and the switch. At any given time, the phone receives power from only one source: the others are used as backup. The phone and switch automatically determine which power source the phone uses. The phone user will experience different results based on which power source is being used by the phone if the power has to be switched to a different source: 1. If you plug a phone into a wall power socket before plugging it into the network, the phone is powered by the power cord. 2. If you then unplug the power cord, the phone resets. If the switch port is configured for 10/100MB, the switch recognizes the loss of power and brings the phone back up. 3. If the switch port is configured for 10MB only, then you must unplug the network connection, and replug it into the phone, in order for the switch to recognize the phone's loss of power. If, however, you plugged the network connection into the phone before you plugged in the power cord, the phone receives power through the switch, and unplugging the power cord will not bring down the phone. Note that if the switch reboots, the phone will then be powered by the power cord, and unplugging the power cord results in a reset. |
These sections describe how you can obtain additional documentation.
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CCO's broad range of features and services helps customers and partners to streamline business processes and improve productivity. Through CCO, you will find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online support services, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
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To display the TAC web site that includes links to technical support information and software upgrades and for requesting TAC support, use www.cisco.com/techsupport.
To contact by e-mail, use one of the following:
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In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers and TAC e-mail addresses worldwide, consult the following web site: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.
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