> 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/web-portal-3-3/protocol-stack/ss7-isup/creating-an-isup-stack.md).

# Creating an ISUP Stack

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

The ISDN user part (ISUP) is the highest layer in the SS7 signaling stack and is responsible for the handling of calls. Once you have configured the MTP3 layer of your SS7 system, you must create an ISDN user part stack.

To create an ISUP stack:

1- Click **ISUP** in the navigation panel.

![CreateIsupStack 0](https://docs.telcobridges.com/w/images/7/71/CreateIsupStack_0.png)

2- Click **Create New Stack**

![CreateIsupStack 1](https://docs.telcobridges.com/w/images/f/f1/CreateIsupStack_1.png)

3- Configure the new ISUP stack:

* Make sure the box labeled **Enabled** is **checked**
* Enter a **name** for the stack
* Select a **primary hardware adapter**
* Select a **secondary hardware adapter**
* Click **Create**

![CreateIsupStack 2](https://docs.telcobridges.com/w/images/4/40/CreateIsupStack_2.png)

4- Verify that the **"IsupStack was successfully created"** message appears

![CreateIsupStack 3](https://docs.telcobridges.com/w/images/4/45/CreateIsupStack_3.png)

**Path**

```
/configurations/@[configuration_name]/isup_stacks/@[isup_stack]
```

**Parameters (text)**

```
/configurations/@[configuration_name]/isup_stacks/@[isup_stack]
enabled                 = true
isup_options            = [ "Event information accept all values", "Extra called number bytes", "Extra calling number bytes" ]
name                    = "@[isup_stack]"
primary_hardware_unit   = "@[hardware_name]"
secondary_hardware_unit = ""

/configurations/@[configuration_name]/isup_stacks/@[isup_stack]/timers
first_group_msg_timer = "5 seconds"
t18_timer             = "15 seconds"
t19_timer             = "5 minutes"
t20_timer             = "15 seconds"
t21_timer             = "5 minutes"
t22_timer             = "15 seconds"
t23_timer             = "5 minutes"
t28_timer             = "10 seconds"
```

**Parameters (json)**

```
{
  "enabled" : true,
  "isup_options" : [
    "Event information accept all values",
    "Extra called number bytes",
    "Extra calling number bytes"
  ],
  "name" : "@[isup_stack]",
  "primary_hardware_unit" : "@[hardware_name]",
  "secondary_hardware_unit" : "",
  "timers" : {
    "first_group_msg_timer" : "5 seconds",
    "t18_timer" : "15 seconds",
    "t19_timer" : "5 minutes",
    "t20_timer" : "15 seconds",
    "t21_timer" : "5 minutes",
    "t22_timer" : "15 seconds",
    "t23_timer" : "5 minutes",
    "t28_timer" : "10 seconds"
  }
}
```

### List of Parameters

* [Name](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#n)
* [Primary Hardware Adapter](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/sccp#p)
* [Secondary Hardware Adapter](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/sccp#s)

**Advanced**

* [Options](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/isup#i)


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