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The
supports downstream forking call flows when dialog transparency is enabled. The following functionality is supported. Spacevars 0 series4
Multiple early dialogs at ingress leg when dialog transparency is enabled. It relays each forked 18x response received for the INVITE at egress leg towards the ingress leg by transparently passing the Call-ID, "From" tag, and "To" tag thus exposing multiple early dialogs at ingress leg.
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The offer/answer negotiation on a forked call depends on the Packet Service Profile configured on either legs. As a result, SDP sent in the forked 18x response(s) towards ingress leg may vary depending on whether pass-through mode or transcoding mode is selected by the
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The following diagram is an example call flow scenario for downstream forking with dialog transparency.
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Call-ID and From tag are assumed to be same in all the responses shown in the above call flow. |
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The following diagram is an example call flow scenario for preserving early dialog context after 200 OK for INVITE.
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The following diagram is an example call flow scenario for support for UPDATE with codec change on inactive early dialog.
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The
retains the call, but deactivates media resources when all the early dialogs are cleared for a forked call either due to 199 or BYE response. Spacevars 0 product
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The following diagram is an example call flow scenario for deactivating media resources when early dialogs do not exist.
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