Querying Device Channel Resources using SIP OPTIONS

The device reports its maximum and available channel resources in SIP 200 OK responses upon receipt of SIP OPTIONS messages. The device sends this information in the SIP X-Resources header with the following parameters:

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telchs: Specifies the total telephone channels and the number of free (available) telephone channels.

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mediachs: Not applicable

Below is an example of the X-Resources:

X-Resources: telchs= 12/4;mediachs=0/0

In the example above, "telchs" specifies the number of available channels and the number of occupied channels (4channels are occupied and 12channels are available).