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The

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supports Post Dial Delay (PDD) for SIP-SIP call on a per-trunk group basis by implementing a configurable PDD timer on the ingress/egress trunk group. If not satisfied, the call is released by sending release messages on both the ingress and egress call legs with the disconnect cause code configured on the associated trunk group.

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A PDD Timer Cancel action occurs in the following scenarios:

• The 

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  cancels the ingress PDD timer when the 18x/200/3xx/4xx/5xx/6xx message is sent from the

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  in the backward direction to the ingress peer.
• The 

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  cancels the egress PDD timer upon receipt of 18x/200/3xx/4xx/5xx/6xx from egress peer.
• Call crankbacks have no effect on a running PDD Timer.

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• If the ingress PDD timer expires, the

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  cancels the call in the forward direction (egress peer) and cranks back to the ingress peer, then sends PDD response code configured on ingress trunk group.
• If the egress PDD timer expires, the

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  cancels the call in the forward direction (egress peer) and cranks back within the

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  ; if an alternate egress route exists, it is used if crank back does not occur to the ingress peer, and PDD response code which is configured on ingress trunk group is sent.

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Info
title Info
Refer to the following pages for PDD configuration details: SIP Trunk Group - Signaling - CLI SIP Carrier Peering: Sip Trunk Group - Signaling - Post Dial Delay (EMA)