> 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/telecom-references/ss7-and-signalling/configuration-of-layer.md).

# Configuration of layer

The configuration of the [ISUP](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/isup/README.md) layer (or addition of new elements to an existing layer) must follow a specific sequence. The following sections will detailed the different resources configuration, their parameters and their use.

General guidelines for the configuration of ISUP for a proper operation include the following:

1. The ISUP general allocation\* must precede all other messages (other configuration ISUP allocation, get, states and stats). The response of this message is an ISUP handle.
2. The ISUP Network allocation must be made (with the ISUP handle from step 1) for a particular network. The response of this message is an ISUP network handle.
3. The ISUP userpart allocation must be made (with the ISUP handle from step 1) for a particular switch variant. The response of this message is an ISUP userpart handle.
4. The ISUP interface allocation must be made (with the ISUP handle from step 1, network handle from step 2 and the userpart handle from step 3) for a particular [OPC](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/signalling/opc/README.md)/[DPC](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/signalling/dpc/README.md). The response of this message is an ISUP interface handle.
5. The ISUP circuit allocation must be made (with the ISUP handle from step 1 and the interface handle from step 4). The response of this message is an ISUP circuit handle associated with a host-provided handle called the “circuit ID”.

**NOTE:** For any reconfiguration with an ISUP message, all reconfigurable parameters must be filled appropriately even if the intention is to modify a single parameter, unless specified otherwise.

**NOTE:** When a reconfiguration is requested through a ISUP API, the effect may not be observed immediately. This is especially true for timers and thresholds as the targeted event might already be active when the reconfiguration occurs. All fields of a configuration (allocation) message must be filled unless explicitly optional or not defined for certain variants.


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