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IP phone one way speech

IP phone one way speech

IP phone one way speech

I have a problem whereby a 5215 IP phone can't hear the far end but the far end can hear him. The far end is another IP set. All on the same network range.

any ideas what this could be?

RE: IP phone one way speech

I have read some issues with the 5215 being set wrong in the Sys Admin Tools.

are you sure you have set it right. IE if its a dual mode 5215, set it as dual mode, rather than a stright 5215, etc.

Apart from that. If it is on the same subnet, and its just switching between them, rather than routed, or firewall'ed. I cant understand it.....

Patch leads all changed? and Tested? Do two PCs work on the same sockets? Can you ping between the phones (there is a ping option within the superkey options of the 5215)


RE: IP phone one way speech

Bad handset?

RE: IP phone one way speech

Thanks Guys,

I haven't swapped the handset yet. First investigated anything obvious. Will be swapping the handset though.


RE: IP phone one way speech

Had a 5215 on a 100Mb FX link on an edge switch without Qos (about 4 hop away from the 33mx), half way through the call, I lost one way of the convasation. I could hear them, they couldnt hear me.

Im assuming that it was lack of QoS but also the engineer at that end reported that the PoE box seamed to loose power breifly at the point I lost the call.


RE: IP phone one way speech

Tanks Tim,

I could well be a POE issue too.


RE: IP phone one way speech


you need to make sure that you have got a router option in the dhcp form on the 3300 if not you will get one way comms on the ip phones.

Also try when the call is connected press any dtmf digit ie number 1 key on the handset


RE: IP phone one way speech


Thanks for the info. Just curious about the DTMF digit thing. What does this achieve?


RE: IP phone one way speech

As he says, in the same network range.  So, no router should/would be involved.

RE: IP phone one way speech

i find the dtmf thing by luck went to press cancel and pressed a key instead and i started to hear the caller

and as far as the router thing goes i always try and put i router address in even if the mitel is not going over the wan


RE: IP phone one way speech

It can not be a PoE issue.  Either the phone is getting power or it's not.  If the power dips below the required threshold the phone will reboot.  It on reboot it does not get enough power it will not pass a system test after displaying the MAC, or you will get a completely blank display (just orange).

What type of data switch is it connected too (ProCurve?)  Is the switch set to auto sense the speed and duplex (10/100, full-half duplex?)

How often does this issue happen?  Is it always the same set?  Is it different callers calling the same set?  Is there any security software applications runnign (such as a self defending network package - Cisco)?  Is there ever a problem with external trunks and this set?  Are you using DHCP or is everything static?

RE: IP phone one way speech

I'm using DHCP. The problem is random and according to the user is internal only. It's only his set I know about. The other parties differ, so the problem is not only between two sets. If he hangs up and makes the call again the problem is sorted.

I am not aware of any security applications and they are using HP Procurves. 2650 and 4000. The ports are set to auto detect.

thanks for the replies so far.


RE: IP phone one way speech

I would swap ports on the ProCurve and see if the problem follows.  If it follows, I would replace the set.  Lets go from there.

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