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Related Articles

 

Prior to SBC 8.

...

2, the 

Spacevars
0product
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 

Spacevars
0product
is enhanced to send the initial INVITE to the egress when it meets the ingress side preconditions.

 

The 

Spacevars
0product
sends the P-Early Media (PEM) header as  sendrecv to ingress when it satisfies the following conditions:

  • The 
    Spacevars
    0product
     invokes the ingress precondition interworking

...

  • The performPrecondtionRenegotiation flag is in enabled state on the ingress trunk group

...


  • The 
    Spacevars
    0product
     supports PEM on the ingress

...

  • The 
    Spacevars
    0product
     does not support PEM on the egress

...

  • The 
    Spacevars
    0product
     plays either early media or performs end-to-end cut-

...

  • through

Command Syntax

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

Command Parameters

Caption
0Table
1preferUPDATEOverReINVITE Parameters
ParameterDescription
performPrecondtionRenegotiation

Enable this flag on the ingress trunk group to allow the 

Spacevars
0product
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
Spacevars
0product
supports this flag for SIP gateway-gateway call.

The options include:

  • disabled
  • enabled

Note:

This

...

flag does not

...

apply when either the dialog transparency flag or

...

the updatedAnswerIn200Ok

...

flag is

...

Spacevars
0product

enabled..

Command Example

Code Block
% set addressContext default zone ZONE_INGRESS sipTrunkGroup TG_INGRESS signaling performPrecondtionRenegotiation enabled

 

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