Version 7.2 571 Mediant 500L Gateway & E-SBC
User's Manual 27. Configuring Supplementary Services
Note:
• If a party that is placed on hold (e.g., B in the above example) is called by another
party (e.g., D), then the on-hold party receives a call waiting tone instead of the
held tone.
• While in a Double Hold state, placing the phone on-hook disconnects both calls
(i.e. call transfer is not performed).
• You can enable the device to handle incoming re-INVITE messages with
"a=sendonly" in the SDP, in the same way as if "a=inactive" is received in the
SDP. This is configured using the SIPHoldBehavior parameter. When enabled, the
device plays a held tone to the Tel phone and responds with a 200 OK containing
"a=recvonly" in the SDP.
27.2 Call Pickup
The device supports the Call Pick-Up feature, whereby the FXS user can answer someone
else's call by pressing a user-defined sequence of phone keys. When the user enters the
user-defined digits (e.g., #77), the incoming call from the other phone is automatically
forwarded to the FXS user's phone.
Note: The Call Pick-Up feature is supported only for FXS endpoints pertaining to the
same Trunk Group ID.
To configure phone keys for call pickup:
12. Open the Gateway Advanced Settings page (Setup menu > Signaling & Media tab >
Gateway folder > Gateway Advanced Settings).
13. In the 'Call Pickup Key' field (KeyCallPickup), enter the sequence of phone keys for
call pickup.
Figure 27-2: Configuring Phone Keys for Call Pickup
14. Click Apply.
27.3 BRI Suspend and Resume
The device supports call suspend and resume services initiated by ISDN BRI phones
connected to the device. During an ongoing call, the BRI phone user can suspend the call
by typically pressing the phone’s “P” button or a sequence of keys (depending on the
phone), and then on-hooking the handset. To resume the call, the phone user typically
presses the same keys or button and then off-hooks the phone. During the suspended
state, the device plays a howler tone to the remote party. This service is also supported
when instead of pressing the call park button(s), the phone cable is disconnected
(suspending the call) and then reconnected again (resuming the call). If the phone user
does not resume the call within a user-defined interval (configured by the HeldTimeout
parameter), the device releases the call.
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