IMG 1010 - Overlap Signaling - Sending - SIP to SS7
There are two methods supported by the IMG to interwork Called Party Number digits between SIP & SS7. One method labeled Enbloc requires that all the Destination address information be included in the IAM or INVITE. The other method is Overlap. The IMG currently supports Overlap Receiving where the destination address is contained in an IAM and SAM sequence of messages or a series of INVITES, each containing one or more destination address digits. The received digits are buffered until the configured minimum number of digits is received at which point the outgoing call is made with the destination address Enbloc. Refer to the IMG 1010 - Overlap Signaling - Receiving and IMG 1010 - Overlap Signaling - Sending - SIP to SS7 topics.
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Right click on Routing Configuration and selecting New Channel Groups. The Channel Groups object is a container object for individual channel groups to be created under. No configuration is needed. Refer to the IMG 1010 - Channel Groups topic for more information on this object.
Right click on Channel Groups object and select New Channel Group. Enter a name to identify the channel group being created.
Select SS7 from the drop down menu of the Signaling Type field.
In the Overlap Enable field select Enabled from drop down menu. This will enable Overlap and opens the next four fields for editing. See screen capture below.
Termination Digit- Select from drop down menu the characters #, *, and 0-9
Minimum # of Digits- Minimum number of digits received to be able to route call.
Inter SAM Timeout- Maximum amount of time between each Subsequent Address Method (SAM). (Default = 1500 milliseconds or 1.5 seconds)
Total Overlap Timeout- Max time allowed for a call to be setup. (Default = 18000 milliseconds or 18 seconds)
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Once the SS7 Channel group is created, the SIP channel group needs to be created. Right click on Routing Configuration and select New Channel Group.
Termination Digit - Not Used. SIP does not use termination digits.
Minimum # of Digits - Minimum number of digits received to be able to route call.
Inter SAM Timeout - Maximum amount of time between each Subsequent Address Method (SAM ). (Default = 4000 milliseconds or 4 seconds)
Total Overlap Timeout- Not Used
Overlap is enabled on both SS7 Channel Group and SIP Channel Group.
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