Cisco 7975G User Manual (English)

Other manuals for Cisco 7975G

Quick Guide14 pages

Software Guide302 pages

Administration Guide217 pages

Troubleshooting And Maintenance24 pages

Installation Manual12 pages

Admin Guide6 pages

Customizing10 pages

Questions and Answers:

H
Holly WatersAug 25, 2025
Why does my Cisco IP Phone have no dial tone or cannot complete a call?
- E
  Erica HarveyAug 25, 2025
  If your Cisco IP Phone displays no dial tone or cannot complete a call, it might be due to several reasons. You may not be connected to the Extension Mobility service, so log into it. The system might require a Client Matter Code (CMC) or Forced Authorization Code (FAC) after dialing a number; if so, enter the required code. Alternatively, time-of-day restrictions might be preventing you from using certain features; in this case, change the time-of-day restrictions.
J
Jay TurnerAug 30, 2025
Why does Barge fail and result in a fast busy tone on my Cisco 7975G?
- S
  Shelby FlemingAug 30, 2025
  Barge fails and results in a fast busy tone because you cannot barge an encrypted call if the phone you are using is not configured for encryption.
T
thompsonkristiAug 29, 2025
What to do if I cannot hear a dial tone or complete a call on my Cisco 7975G IP Phone?
- D
  Darren DixonAug 29, 2025
  There are several reasons why you might not be able to hear a dial tone or complete a call. You may need to log into the Extension Mobility service. If you are using an SCCP phone, you might need to enter a client matter code (CMC) or forced authorization code (FAC) after dialing a number. It's also possible that your phone has time-of-day restrictions that prevent you from using some features during certain hours.
C
cherryjennyAug 28, 2025
Why am I disconnected from a call I joined using Barge on my Cisco 7975G?
- C
  Charlene PhillipsAug 28, 2025
  You are disconnected from a call that you have joined using Barge if the call is put on hold, transferred, or turned into a conference call.
K
Kristen MillsAug 28, 2025
Why does my Cisco 7975G show a Call Forward All error message?
- A
  Allison HarrisonAug 28, 2025
  If you encounter a Call Forward All Error Message on your Cisco IP Phone, it may be because your phone rejects your attempt to set up Call Forward All directly on the phone if the target number that you enter would create a Call Forward All loop or would exceed the maximum number of links permitted in a Call Forward All chain. Contact your system administrator for details.
J
johnsonbrendaAug 27, 2025
What to do if softkey is missing on Cisco 7975G IP Phone?
- T
  Tracy GibsonAug 27, 2025
  If you see a 'Missing Softkey' on your Cisco IP Phone, there might be additional softkeys to display. Press the More button to reveal them. The state of the line determines the phone softkeys, so try changing the line state (for example, go off-hook or have a connected call). If the issue persists, your phone may not be configured to support the feature associated with that softkey. In this case, contact your system administrator to request access to the feature.
B
bellallisonAug 27, 2025
Why does my Cisco IP Phone screen appear blank?
- S
  Stacy ParkerAug 27, 2025
  If the screen on your Cisco IP Phone appears blank but the Display button is lit, the phone is powered down (sleeping) to save energy. The phone will power up (wake) when the system sends the wake up message. You cannot wake the phone before its scheduled power up time. To wake up the phone plug in the power adapter. Unplugging and plugging it back in will not wake up the phone while it is sleeping.
A
Adam FloydAug 26, 2025
What to do if Cisco 7975G IP Phone cannot obtain a DHCP-assigned IP address after a factory reset?
- R
  rebeccamurrayAug 26, 2025
  If your Cisco IP Phone cannot obtain a DHCP-assigned IP address, and these errors typically indicate that the phone has completed a factory reset while 802.1X was enabled, then temporarily disable 802.1X authentication on the switch. Alternatively, temporarily move the phone to a network environment that is not using 802.1X authentication. Once the phone starts up normally in one of these conditions, you can access the 802.1X configuration menus and re-enter the shared secret.
M
millermatthewAug 25, 2025
What to do if Cisco Unified IP Phone resets unexpectedly?
- J
  Jake Brown MDAug 26, 2025
  If your Cisco Unified IP Phone is unexpectedly resetting, several factors could be at play. First, check the Ethernet connection to ensure it's active and that there are no cable breaks. It's also worth investigating whether intermittent network outages are affecting voice traffic. Make sure the phone is properly configured to use DHCP, or if a static IP address is assigned, verify the settings are correct. Isolating the phones on a separate auxiliary VLAN may also improve voice traffic quality. To see if the phone received a reset command from Cisco Unified Communications Manager, press the Applications Menu button, then go to Settings > Status > Network Statistics. Look for 'Reset-Reset' or 'Reset-Restart' messages.
T
Tamara RobinsonAug 25, 2025
Why does my Cisco 7975G IP Phone keep resetting unexpectedly?
- A
  Aaron WatersAug 25, 2025
  Your Cisco Unified IP Phone might be resetting due to several reasons. First, ensure the Ethernet connection is active, checking for port, switch, or cable issues. If voice network problems exist, investigate them. Confirm that the phone is properly configured for DHCP and that the DHCP server is correctly set up with a lease duration Cisco recommends to be 8 days. If a static IP address is used, verify its settings. Heavy network usage without a voice VLAN, unauthorized resets by other administrators, or DNS/connectivity errors could also be the cause. As a troubleshooting step, you can use the Erase softkey to reset the phone to its default values or power cycle the phone.

Cisco 7975G Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Grey, Silver
Speakerphone	Yes
Voice codecs	G.711Mu, G.711a, G.722, G.729A, iLBC
Number of melodies	24
Aspect ratio	4:3
Display diagonal	5.6 \
Display resolution	320 x 240 pixels
Lines quantity	8 lines
Phonebook capacity	- entries
Number of VoIP accounts	-
Front camera	No
Security algorithms	128-bit AES
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	DHCP, TFTP
Volume control	Digital
Headphone outputs	1
Ethernet LAN (RJ-45) ports	2
Number of handles included	1 pc(s)
AC adapter output voltage	48 V
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Certification	FCC