Mitel Phone hold issue

[philellis]

Hi,

We are having a mitel issue in our school where by when a user puts a caller on hold they are then unable to get the caller back off hold and instead ends up hanging up on the caller.

Any thoughts or suggestions on how to rectify this issue or where to look?

Thanks for any help,
Phil

[Dogbreath]

http://mitelforums.com/forum/index.php?topic=11085.0

[philellis]

Thanks for the link. it seems as though that guy was having a similar issue however the option on my mitel for avoid signalling hold to the peer is already set to yes.

Its a mystery!

[Dogbreath]

The answer is probably going to be, it's a NAT issue.

Is the issue 100% reproducible or is it intermittent?

How is your controller connecting to SIP? On-site SIP gateway [this makes it less likely to be a NAT problem] or going to SIP provider on the internet with edge device doing some SIP rewriting? Or something more exotic?

Once you've double-checked the settings either on your edge device or on your SIP gateway, I would do a packet capture and look at what's happening when trying to retrieve a call from hold.

Maybe you could set "Avoid signalling hold to the Peer" to No