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Prior to SBC 8.
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2, the supported ingress precondition interworking when the ingress side of the call
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supported precondition attributes, but when the egress side of the call
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did not.
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The is enhanced to send the initial INVITE to the egress when it meets the ingress side preconditions.
The sends the P-Early Media (PEM) header as sendrecv
to ingress when it satisfies the following conditions:
- The invokes the ingress precondition interworking
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- The
performPrecondtionRenegotiation
flag is in enabled state on the ingress trunk group
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- The supports PEM on the ingress
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- The does not support PEM on the egress
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- The plays either early media or performs end-to-end cut-
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Command Syntax
Code Block |
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% set addressContext default zone <zone_name> sipTrunkGroup <siptrunkgroup_ingress_name> signaling performPrecondtionRenegotiation
<enabled | disabled> |
Command Parameters
Caption |
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0 | Table |
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1 | preferUPDATEOverReINVITE Parameters |
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|
Parameter | Description |
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performPrecondtionRenegotiation
| Enable this flag on the ingress trunk group to allow the 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 supports this flag for SIP gateway-gateway call.The options include: Note: This |
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apply when either the dialog transparency flag or |
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Command Example
Code Block |
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% set addressContext default zone ZONE_INGRESS sipTrunkGroup TG_INGRESS signaling performPrecondtionRenegotiation enabled |