You are viewing an old version of this page. View the current version.

Compare with Current View Page History

Version 1 Current »

Related Articles

 

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

Command Syntax

% set addressContext default zone <zone_name> sipTrunkGroup <siptrunkgroup_ingress_name> signaling performPrecondtionRenegotiation 
<enabled | disabled>

Command Parameters

preferUPDATEOverReINVITE Parameters

ParameterDescription
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. The
Unable to show "metadata-from": No such page "_space_variables"
supports this flag for SIP gateway-gateway call.

The options include:

  • disabled
  • enabled

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"
.

Command Example

% set addressContext default zone ZONE_INGRESS sipTrunkGroup TG_INGRESS signaling performPrecondtionRenegotiation enabled

 

  • No labels