> 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-the-sctp-configuration.md).

# Creating the SCTP Configuration

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

Stream Control Transmission Protocol (SCTP), a Transport Layer protocol, ensures a reliable in-sequence transport of messages.

To edit your SCTP configuration:

1- Select **SCTP** from the navigation panel

![CreateSctp 0](https://docs.telcobridges.com/w/images/f/fa/CreateSctp_0.png)

2- Configure the SCTP service

* Make sure the box labeled **Enabled** is **checked**
* Enter a **name** for the SCTP service
* Select an appropriate **service type**:
  * [RAW\_IP](https://prosbcdocs.telcobridges.com/telecom-references/sip-and-voip/ip-network/raw-ip)
  * [UDP](https://prosbcdocs.telcobridges.com/telecom-references/sip-and-voip/ip-network/udp-ip)
* Click **Create**

![CreateSctp 1](https://docs.telcobridges.com/w/images/a/a3/CreateSctp_1.png)

3- Verify that the **"Sctp Cfg was successfully created"** message appears

![CreateSctp 2](https://docs.telcobridges.com/w/images/b/b9/CreateSctp_2.png)

**Path**

```
/configurations/@[configuration_name]/hardware_units/@[hardware_name]/sctp_stacks/@[sctp_stack]
```

**Parameters (text)**

```
/configurations/@[configuration_name]/hardware_units/@[hardware_name]/sctp_stacks/@[sctp_stack]
enabled             = false
name                = "@[sctp_stack]"
sctp_service_type   = "RAW_IP"
udp_tunneling_port  = 9899

/configurations/@[configuration_name]/hardware_units/@[hardware_name]/sctp_stacks/@[sctp_stack]/advanced_parameters
accept_add_life_time = true
domain_name          = ""
initial_window_space = 32768
max_asso_retransmits = 3
max_init_retransmits = 8
max_path_retransmits = 2
md5_expiry_timer     = "5 seconds"
mtu_size             = 1024
send_init_with_ip    = false
send_shutdown        = false
use_adler32_checksum = false

/configurations/@[configuration_name]/hardware_units/@[hardware_name]/sctp_stacks/@[sctp_stack]/dns_cfg
address         = ""
dns_port        = 53
enabled         = false
max_query_retry = 3
query_timer     = "20 seconds"
```

**Parameters (json)**

```
{
  "advanced_parameters" : {
    "accept_add_life_time" : true,
    "domain_name" : "",
    "initial_window_space" : 32768,
    "max_asso_retransmits" : 3,
    "max_init_retransmits" : 8,
    "max_path_retransmits" : 2,
    "md5_expiry_timer" : "5 seconds",
    "mtu_size" : 1024,
    "send_init_with_ip" : false,
    "send_shutdown" : false,
    "use_adler32_checksum" : false
  },
  "dns_cfg" : {
    "address" : "",
    "dns_port" : 53,
    "enabled" : false,
    "max_query_retry" : 3,
    "query_timer" : "20 seconds"
  },
  "enabled" : false,
  "name" : "@[sctp_stack]",
  "sctp_service_type" : "RAW_IP",
  "udp_tunneling_port" : 9899
}
```

### List of Parameter

* [Name](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#n)
* [Service Type](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#s)

**DNS Parameters**

* [Enabled](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/sip#e)
* [DNS Port](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/server-dns-port)
* [Query Timer](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#q)
* [Max Query Retry](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#q)
* [Server Address](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#s)

**Advanced Parameters**

* [Send SHUTDOWN before rebooting](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#s)
* [Send INIT with IP address parameter](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#s)
* [Use adler32 checksum](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#u)
* [Initial window space](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#i)
* [MTU size](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#m)
* [Max INIT retransmissions](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#m)
* [Max ASSO retransmissions](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#m)
* [Max PATH retransmissions](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#m)
* [Life time of MD5 keys](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#l)
* [Accept additional lifetime](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/m3ua#a)
* [Domain name](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/sip#d)


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