Question about Cisco 7945G IP Phone
I have a Cisco 7945G telephone that has issues with the other party not being able to hear anything from this phone. In other words, if I call someone from this phone, I hear them fine, but they can't hear me. It is silent for them. I also noticed that I don't hear my own voice coming through the handset when I talk. I assumed I had a bad handset so I swapped it with a handset from another identical phone, thinking it might be the internal mic on the handset. But that did not resolve the issue. I tried using a Plantronics headset with this phone and had the same problem. However, if I use the speakerphone function, then callers hear me fine. I tried a factory reset of the telephone but that did not resolve the issue either. Do I just have a defective phone?
There are a couple different things, that may cause "one way audio". For example, it could be problem with the network, when network traffic between you and other party (or gateway) goes fine to you (so, you can hear), however it gets lost from you (that's why they cannot hear you). However, since it works with a speakerphone, it's not your case.
Another possible cause - bad handset or "curly cord". You may try to borrow a handset and cord from other phone, and see, if it fixes a problem.
Then it could be "human error". For example, if you activated a headset button, even though inbound audio will be heard on both, headset and handset, microphone circuit is completely switched to a headset port, and remote party will not hear you (or, if you have a headset connected, will hear only whatever picked by the microphone on the headset).
And worst case scenario - your phone is bad (for example, someone connected something bad into the handset or headset port, and burned circuit).
Mike / CCNP, CCVP, CCDP, CCSP
Headset Adapter Co.
PS. In some cases headsets may not work due to insufficient power, and will require an additional power supply. However if phone is powered up and booted, it should work with a handset.
Posted on Oct 03, 2014
Could be a bad hook switch on the phone if you plug a different phone in does it work as it should?
Posted on Jun 02, 2014
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Posted on Jan 02, 2017
You'll need to buy a another power supply unless you have power over Ethernet. The power supply for 7940G/7960G is CP-PWR-CUBE and for 7941G/7945G you'll need a CP-PWR-CUBE-3. Yes, I know, I just got one of those and it's a pain to configure it, but I got it working... ;-)
P.S. If you haven't notice, you will be dealing with a whole different thing, the configuration/settings will ALL (except for the dialplan file) different from the 7940G... Good Luck ;-)
Posted on Aug 03, 2009
If you used the traditional keypress sequence where you hold down the * key, reboot the phone, and then press the keys in sequence, you may be stuck in a boot loop. You might need to connect your phone to a network if your phone is trying to reach a TFTP server to fetch a firmware or config file update. If you need a power supply, you might try CiscoPowerCube.com they sell a cross compatible version of the CP-PWR-CUBE3 which includes the cord.
Posted on Dec 05, 2012
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