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This sounds like an RTP stream issue. While SIP runs on port 5060 by default, the actual audio is run on much higher ports, 10000 and up. If your pbx system is not on a public address and you are forwarding traffic to your pbx via a router, check the RTP port range in your pbx and make sure you are forwarding those ports correctly. By putting the call on hold, you stop sending out audio traffic restart sending audio when you pick the call back up. By forwarding the entire RTP range to your pbx, this should fix your issue.
You will need your system administrator to change the call reroute assignment of your phone, or you have call forwarding active to a location the system can not route a call to. Either scenario your phone administrator can resolve quite easily.
There are a number of reasons why this could happen.
1) The most common is you have call forwarding always. When you lift your handset do you hear stutter dial tone? if you do you have a feature active on your phone. To correct this you will need to turn the call forwarding feature off You will have to get the code from your system administrator or go through your superkey (the Blue Key) using the # until you find the call forwarding options and review and turn it off (Change).
2) It's possible you have Do not Disturb active.
3) its also possible you have Make busy active
2 and 3 can be removed by the clear all feature code but 1 must be cleared using the method I described. Get these codes from the system admin.
1. The changes in the ring tone has to be made by accessing the Avaya server where the phones are registered. 2. Log in to the avaya server...... enter change station <station number> on the command prompt 3. In the personalized ring pattern field, you can select one out of the 8 available options by typing any digit between from 1 to 8.
4. The ring pattern of that particular station will change accordingly.
5. Keep the personalized ring pattern of all the stations different by assigning different digits against this value
Ok this post is OLD, but for anyone else having this issue, this is the solution...
There is a programming feature that states: DELAYED RING on certain lines, meaning you can physically see a call coming in to the system (via line flashing), but it will not ring at your desk till something like the 4th ring(hence the name DELAYED ring).
If your set does not ring, and you pick up the heandset, the phone system doesn't know if you want to answer the call -or- you just want to make an outgoing call...
Therefore the Mitel system picks up internal dialtone and waits for you to make the initial reaction (hit 9 for a line out or hit a line that is flashing on the set).
Too change this option, a Mitel Tech is required...