Version 5.8 515 October 2009
SIP User's Manual 9. IP Telephony Capabilities
9.13 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:
îš„ telchs: specifies the total telephone channels as well as the number of free (available)
telephone channels
îš„ 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 total telephone channels and the number of
free (available) telephone channels (8 channels are available for use out of a total of 4
channels).
9.14 Working with Supplementary Services
The device supports the following supplementary services:
îš„ Call Hold and Retrieve (refer to ''Call Hold and Retrieve'' on page 515)
îš„ Con
sultation (refer to Consultation Feature on page 518)
îš„ Call Tran
sfer (refer to ''Call Transfer'' on page 518)
îš„ Call Fo
rward (refer to ''Call Forward'' on page 519)
îš„ Call Fo
rward Reminder ring (refer to Call Forward Reminder Ring on page 520)
îš„ Call Waiting - 182 Que
ued Response (refer to Call Waiting on page 521)
îš„ Messag
e Waiting Indication - MWI (refer to Message Waiting Indication on page 521)
îš„ Calle
r ID (refer to Caller ID on page 522)
îš„ Thre
e-way conferencing (refer to ''Three-Way Conferencing'' on page 524)
To a
ctivate these supplementary services on the device, enable each service’s
corresponding parameter using the Web interface or ini file.
Notes:
• All call participants must support the specific supplementary service that
is used.
• When working with certain application servers (such as BroadSoft’s
BroadWorks) in client server mode (the application server controls all
supplementary services and keypad features by itself), the device's
supplementary services must be disabled.
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