ISUP CPG
Introduction
The N-Squared codec for the ISUP CPG (Call Progress) message expects/returns an object with the following attributes.
No variants are supported.
| Field | Type | Description |
|---|---|---|
.message_type |
44 |
The value is an unsigned octet with a constant value. This element is present after using the "any message" N2::ISUP::Codec::decode method.The constant value 44 identifies that the decoded message was detected to be an CPG message. |
| Backward Call Indicators | [See Parameters] | The Backward Call Indicators parameter is mandatory for this message. The encoding/decoding is performed as described in the Parameters documentation. In this mandatory form, the tag is not included (it is implicit). But the parameter encoding is identical otherwise. |
| [Optional Parameters] | Various | Any known Optional Parameters will be encoded/decoded if present. The codec will encode/decode any optional parameter which is present, and does not attempt to apply checking to determine if the parameter is "expected" for this message or not. |