> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/tmedia-documentation/configuration/isdn-nfas-overlap-parameters.md).

# ISDN/NFAS Overlap Parameters

> **Applies to:** Tmedia 3.0, 3.2, 3.3

Overlap parameters enable default ISDN call settings to be tailored for specific needs. If for example there is a limit of 20 digits to the called destination number and more digits are required, it is possible to adapt the configuration to use the "Overlap Sending" method.

**To configure Overlap Parameters:**

1- Click **NAPs** in the navigation panel

![Isdn Nap 0](https://docs.telcobridges.com/w/images/c/c9/Isdn_Nap_0.png)

2- Click **Edit** to modify a NAP .

![Overlap 1 B](https://docs.telcobridges.com/w/images/f/f9/Overlap_1_B.png)

3- Click **Overlap Params** to view options.

* Set the **Enable Overlap Sending** checkbox.
* Set other parameters as required
  * Enter the number of digits to send in the **Overlap Receiving Expected Digits** field.
* Click **Save** ![Overlap 2 B](https://docs.telcobridges.com/w/images/8/8a/Overlap_2_B.png)

**Path**

```
/configurations/@[configuration_name]/naps/@[nap_name]
```

**Parameters (text)**

```
/configurations/@[configuration_name]/naps/@[nap_name]
default_profile    = "default"
isup_cic_groups    = [ "CHTI01", "CHTI02" ]
name               = "CHT_Taiwan"

/configurations/@[configuration_name]/naps/@[nap_name]/tdm_cfg/overlap_parameters
enable_overlap_receiving              = false
overlap_receiving_expected_digits     = 0
overlap_receiving_inter_digit_timeout = "20 seconds"
overlap_receiving_timeout             = "0 millisecond"
```

**Parameters (json)**

```
  "default_profile" : "@[profile_name]",
  "isup_cic_groups" : [
    "CHTI01",
    "CHTI02"
  ],
  "name" : "@[nap_name]",
  "tdm_cfg" : {
    "append_f_to_outgoing_calls" : true,
    "channel_usage" : "Even highest CIC",
    "overlap_parameters" : {
      "enable_overlap_receiving" : false,
      "overlap_receiving_expected_digits" : 0,
      "overlap_receiving_inter_digit_timeout" : "20 seconds",
      "overlap_receiving_timeout" : "0 millisecond"
    },
    "remove_trailing_f_or_pound_from_incoming_calls" : true
  }
}
```


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