You are viewing an old version of this page. View the current version.
Compare with Current
View Page History
Version 1
Current »
Prior to SBC 8.1 , the Unable to show "metadata-from": No such page "_space_variables"
supported ingress precondition interworking when the ingress side of the call supports precondition attributes, but the egress side of the call does not. The SBC sends out the initial INVITE to the egress when it meets the ingress side preconditions.
The Unable to show "metadata-from": No such page "_space_variables"
sends the P-Early Media (PEM) header as sendrecv
to ingress when it satisfies the following conditions:
- The
Unable to show "metadata-from": No such page "_space_variables"
invokes the ingress precondition interworking. - The
performPrecondtionRenegotiation
flag is in enabled state on the ingress trunk group.
- The
Unable to show "metadata-from": No such page "_space_variables"
supports PEM on the ingress. - The
Unable to show "metadata-from": No such page "_space_variables"
does not support PEM on the egress. - The
Unable to show "metadata-from": No such page "_space_variables"
plays either early media or performs end-to-end cut-thru
% set addressContext default zone <zone_name> sipTrunkGroup <siptrunkgroup_ingress_name> signaling performPrecondtionRenegotiation
<enabled | disabled>
preferUPDATEOverReINVITE Parameters
Parameter | Description |
---|
performPrecondtionRenegotiation
| Enable this flag on the ingress trunk group to allow the Unable to show "metadata-from": No such page "_space_variables" to renegotiate the precondition on the ingress when there is a change in SDP during early dialog phase or whenever the call goes to confirmed state. TheUnable to show "metadata-from": No such page "_space_variables" supports this flag for SIP gateway-gateway call.The options include: Note: This is not applicable when the dialog transparency flag or the updatedAnswerIn200Ok flag is in enabled state on the Unable to show "metadata-from": No such page "_space_variables" .
|
% set addressContext default zone ZONE_INGRESS sipTrunkGroup TG_INGRESS signaling performPrecondtionRenegotiation enabled