How to enable media cut through for H323 clients in CCM?

Set the Service Parameter, H225 Device Connect Timer to either 0 or 1.

Default is 0 and media cut through is enabled. To disable set it to 2.

How to setup CCM to accept calls from H323 gateways that are not defined locally?

Change the service parameter “Accept Unknown TCP Connection” to True

Default is False

How to prepend digits to called id in MGCP

Based on the ISDN number plan and type of the incoming call, the following values will be used to prepend the Caller ID.

National number prefix

International number prefix

Subscriber number prefix

Unknown number prefix

Overlap receiving flag for PRI

To enable Overlap receiving for PRI interfaces that you the PRI Backhaul mechanism

Matching calling party with Attendant DN

If an Attendant DN is configured on FXO port and this parameter is set to True, then Callmanager will limit outbound calls from that DN to only use the FXO port that is configured with that Attendant DN. You would need to create a route pattern and include this FXO port in the route list. Even though there are other gateways that could be listed above in the route list, it would still use this gateway only.

Also, none of the other phones will be able to use this gateway even though this gateway appears in the route list.

Disable resume from MGCP shared line FXS port

This parameter determines if you can resume a call from hold on a MGCP FXS shared line.

Default value is true

Caller ID

This is a global setting for Caller ID for all gateways. You can also set the Caller ID individually at the gateway level

Service parameters to change on startup

1. BRQ – True

2. AAR – True

3. Call Diagnostics enabled – True

AAR and out of bandwidth messages

1. Out of bandwidth text — this text is displayed when AAR is not enabled and there is not enough location bandwidth

2. AAR Congestion rerouting text — this text is displayed when AAR is enabled and rerouting occurs

Auto answer timer

Decides how many seconds before answering the call automatically. Should be less than T 301 as well as Call forward no answer ring duration.

Barge and Privacy

Built-in bridge enabled:

True: is needed to enable the bridge in the phone for barge in feature. Built in bridge supports only G711.
False: Default

Privacy:

Will decide if the call state information  is displayed on shared lines and also if barge is allowed via shared lines.

True: Default. No call state information is displayed across shared lines and barge is not allowed
False:

Always use Prime line

Always use Prime line

False: For an incoming call on any line, when you go off hook the call will be answered. Is the default.
True: Will always use the first line when you go off hook. Inorder to answer an incoming call on any other line, you need to hit the ringing line button.

Always use Prime line for voicemail

False: When you hit the messages button, will select the line which has a message waiting.

True: When you hit the messages button, will always use the first line

Call Classification and toll fraud prevention

Call Classification classifies the call type. Valid values are On-net and Off-net. Default is off-net. This can be set at the gateway level as well. By default the gateway is set to Use System default.

This parameter works with Block off-net to off-net transfer. Default is false. Hence by default the system will allow trunk to trunk transfer.

Call progress timers

1. T301 – timers between alerting and connect. This is the interval that Callmanager will keep ringing the remote phone and if no answer will drop the call after this interval. This should be more than the Call forward no answer and auto answer duration.

Default is 180 seconds

2. T302 – Interdigit timeout

Default is 15 seconds

Keepalive timers

Station KeepAlive Interval

Keepalive between phones and Primary Call processing server

Defauit: 30 sec

Station and Backup Server KeepAlive Interval
Keepalive between phones and Secondary Call processing server
Default: 60 sec

Tone on Hold

Tone on Hold -  3 options

0 – disabled for MGCP, play once for other devices

200000 – disabled for all device

any non zero value greater than 5 – plays tone on hold for all devices every that many seconds

Default: 10

How to enable blind transfer in IP Phones connected to Callmanager?

By default, blind transfer is not enabled for IP Phones. When you try to transfer a call, it would place the first line on hold and grab the second line and perform a consult transfer. To enable blind transfer, change the service parameter

Transfer On-hook Enabled to True.

This will allow users to hit the transfer softkey and dial the number and either go on-hook or hit the transfer softkey again to complete the call.