Prior to SBC 8.2, the SBC supported ingress precondition interworking when the ingress side of the call supported precondition attributes, but when the egress side of the call did not.
The SBC is enhanced to send the initial INVITE to the egress when it meets the ingress side preconditions.
The SBC sends the P-Early Media (PEM) header as sendrecv
to ingress when it satisfies the following conditions:
- The SBC invokes the ingress precondition interworking
- The
performPrecondtionRenegotiation
flag is in enabled state on the ingress trunk group - The SBC supports PEM on the ingress
- The SBC does not support PEM on the egress
- The SBC plays either early media or performs end-to-end cut-through
Command Syntax
% set addressContext default zone <zone_name> sipTrunkGroup <siptrunkgroup_ingress_name> signaling performPrecondtionRenegotiation <enabled | disabled>
Command Parameters
Command Example
% set addressContext default zone ZONE_INGRESS sipTrunkGroup TG_INGRESS signaling performPrecondtionRenegotiation enabled
Overview
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