====== Grandstream UCM Vitelity Trunk ======

See also **[[voice:pbx:grandstream_pbx#voip_trunks|Grandstream UCM6100 Series IP-PBX]]**

See also **[[voice:phones:grandstream:grandstream_provisioning|Grandstream Phone Provisioning Notes]]**

See also **[[voice:vitelity:vitelity|Vitelity SIP Service]]**

This is almost certainly not the only way to configure a Vitelity SIP trunk with a Grandstream UCM PBX.

===== Register or Route =====

<note tip>Some entry-level Grandstream UCM devices have a router function.  Unless your UCM will be **the** (NAT) router for your LAN, you will probably want to set the two Ethernet ports to **switch** mode.  This disables the routing and NAT, simplifying configuration.
</note>

**UCM -> System Settings -> Network Settings -> Basic Settings -> Method -> Switch**

==== Registration ====

:!: We use **sip23.vitelity.net** for registration.

:!: You probably do **not** want or need any port forwarding when using a **registration** SIP account.

:!: For **registration** accounts, choose **Register SIP Trunk** as the **Type** when creating a new trunk.

==== IP Routed ====

:!: For **IP routed** accounts, choose **Peer SIP Trunk** as the **Type** when creating a new trunk.

:!: You probably **need** port forwarding when using a **IP routed** SIP account with a PBX behind NAT.

:!: Best security is attained by limiting the port forwarding to a [[voice:vitelity:vitelity|list of Vitelity servers]].  

These are the likely ports you need to forward into your PBX:

|Protocol |Ports                  |
| UDP     |5060-5061,10000-20000  |

Note that these are just the most common ports forwarded to PBXs. Depending on your reality, you may need to change these port numbers.

===== Trunk Configuration =====

:!: After saving the basic trunk definition, edit **Advanced Settings** and select **Enable Heartbeat Detection** to monitor registration status (qualify).

:!: While editing **Advanced Settings**, you should set the **Maximum Number of Call Lines** to limit exposure if hacked.  You might set it to your estimate of the anticipated maximum number of simultaneous calls.

{{ :voice:vitelity:gs_ucm_vitelity_trunk.png?direct&750 |}}

{{ :voice:vitelity:gs_ucm_vitelity_trunk_basic.png?direct&750 |}}

{{ :voice:vitelity:gs_ucm_vitelity_trunk_advanced.png?direct&750 |}}