Cisco VOIP TTY

[SpaceA]

Hi Everyone,

Does anyone know what it takes to have TTY on Callmanager 4.1?
I would like to know what kind of requirements like; hardware,software and does it require some special phone?
Does anyone have experience on this, I heard in order for it to work it require QoS otherwise there are a lot of packet drops.
Thanks.

 

[whykap]

You need an FXS port registered and configured to the call manager and a TTY analog device (phone).
If you have call manager your should already have QoS configured on the network. There is no specific QoS for analog devices or TTY specific.

 

[SpaceA]

So, what's the different between getting a direct TTY service from the service provider and getting this and hooking it up to the callamanger?

 

[whykap]

I don't know that. Never dealt with TTY through a service provider. The extend of my TTY experience is installing and analog TTY device to a phone system.

 

[SpaceA]

Can you give me an example on what kind of phone you use for TTY with VoIP. The FXS port, does that goes in the gateway? Thanks.

 

[whykap]

The FXS port can be in the gateway as a module or a vg-224 which gives you 24 FXS ports.
I leave it up to the customer to choose a TTY device. They are not VoIP specific. They work as well with the call manager or any other manufacturer whether it it IPTEL or legacy PBX.

 

[SpaceA]

Thanks for the info, been a great help.