SX200 DHCP server lease time change

[craigliu]

We use SX200, TeleWorker 600 and 5220 MITEL IP phone. Occasionally we use the phone to talk, a few of our phones pause for 2-3 seconds every 1 minute. After sometime this phonomenon disappear automatically. It'll happen again for other phones.

It is said that we need to set the lease time of DHCP server as "PERMANENT". But when I check our DHCP server of sx200, the lease time is " PERMANENT" and there seem no way to change it. All options I can see is "HOUR, WEEK MONTH" etc.

My question is that
1) Is " PERMANENT" right setup for the lease time or not? Should I change it into "PERMANENT". If I should change, how can I change it from " PERMANENT" to "PERMANENT".

2) Is the leaetime setup to "PERMANENT" a right solution to solve our phone's pause problem? If not, what is your suggestions?

Any respone is welcome. Thanks. Very much.

 

[IseeVoices]

Using Teleworker is a tricky thing. However, setting up countless of them, it usually reverts back to a network issue (IE Bandwidth,Bottlenecking). Permanent is fine for the DHCP setting, because your pause is coming from the negotiation from the phone to the Teleworker Server thru the cloud. I would first check something that is coming thru a PC or something else that might be on that is chewing up the traffic and making it stall. Just to make sure, the issue you are having is on the Teleworker phones? Alot depends on the size of the Network connection/DSL Speed and also what equipment is in place. The stalling is for sure a network bandwidth issue rather than a DHCP one. Hope this helps

 

[kwbMitel]

Craigliu, is the problem with local phones or with remote (TW) phones?

Either way, do all phones have the issue or just some?

DHCP is very unlikely to be the source of your issue either way.



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Occam's Razor - All things being equal, the simplest solution is the right one.

 

[craigliu]

Thanks for your response.

The phone that is now in problem is a remote phone. But in the past our local phones have similar problem.

Here is a description for this problem:

"Every 60 seconds, it times out. When it comes back - 60 seconds from that point it will time out again.
Again, the same thing happens. On the display in the right hand corner, you see a bar followed by 2 dashed. ( | - - )
Once it turns to three bars, ( | | | ), the call comes back."

The problem for one phone will disappear automatically in a few days. But it will happen again for other phones. It seems it happens randomly.

 

[kwbMitel]

The symptoms you are describing are indicative of the phone losing connection with the controller. When Idle, the phone performs constant heartbeat checks to maintain connection. If the heartbeat fails, the phone will failover. if no failover point is available, the phone will display as you describe and eventually failback.

You need to find the network issue causing communication errors.

*******************************************************
Occam's Razor - All things being equal, the simplest solution is the right one.

 

[craigliu]

Thanks MitelGod and kwbMitel.

Both of you think it is a connection/network problem. But it is most less possibility in my mind because our connection and bandwidthd should be much OK for IP phones, especially in LAN.

I'll pay much attention on the connection. But is there any configuration parameters in SX200 to make it more tolerant for connection/network issues?

Thanks.

 

[kwbMitel]

Your last question is self contridictory. If your network connections are sound, why would you need the controller to be more tolerant of connection/network issues?

Reverse the question, is there any configuration parameters in your network that you can improve to eliminate the apparent connection/network issues?

*******************************************************
Occam's Razor - All things being equal, the simplest solution is the right one.

 

[IseeVoices]

To troubleshoot, I would take the remote phone home and put on your DSL to see if it ever stalls, that will isolate the problem to tell you whether the network is in fact hiccuping or if there is a Mitel issue with the Server/Phone. The network may be stable but there could be something in the firewall on the communication back in. There are Firewall ports to open when using remote phones. The following ports need to be open for it to function properly (if behind a firewall). The ports needed can be found on the Mitel Site under Teleworker Engineering Guidelines. I can provide if needed. But, try the phone on a different network first, if it stays up, its a LAN issue.

 

[JimHilton]

Tell us about about your LAN. Are the computers and sets on the same subnet?

If yes, are you plugging into the IP sets first and then running off the set to the PC?

If yes or no, do you have 2 devices handing out DHCP ips?

If yes, what type of switch is it? Is it possible the back plane is getting slammed (An indicator could be that the pc's loose connectivity for a few seconds as well).

If yes, how much of a nightmare would it be for you to change the controller to its own subnet?

How do the remote sets connect to the TW server? Have you got 2 nics in it, or have DMZ'd the TW ip to outside world?

My reason to request the telco have its own switch/subnet is it will totally rule out any existing network issues.

Jim

 

[craigliu]

Thanks for all your response. It seems that most possibilities are due to network connection. We have 3 remote phones, now only one phone has this problem. In March or April, one phone in LAN has similar problem.

Yesterday, I restarted the SX200 ICP by pressing reset button (Only restart. no any changes. But I'm not sure whether there is any changes since last boot.). Up to now all remote phones seem working fine.