Restrictions for Cisco UBE Mid-call Re-INVITE/UPDATE Consumption
The Cisco UBE Mid-call Re-INVITE consumption feature works only in Cisco UBE and Session Initiation Protocol - Session Initiation Protocol (SIP) calls and not for SIP-H.323 or in TDM Gateways.
Cisco UBE Session Description Protocol (SDP) -passthrough does not work with Cisco UBE Mid-call Re-INVITE consumption.
codecT is configured, the offer from Cisco UBE will only have audio codecs, and not video codecs and so the video codecs are not consumed.
Cisco UBE Mid-call Re-INVITE/UPDATE consumption works only if the
flow-throughcommand is configured. If the
flow-around command is configured, Re-INVITEs/UPDATEs will not be consumed.
Media Antitrombones are media loops in a SIP entity due to call transfer or call forward. When Media Antitrombone feature is configured, Cisco UBE moves dynamically to
flow-aroundas a result media antithrombone takes precedence over the Cisco UBE Mid-call Re-INVITE/UPDATE consumption feature.
Video transcoding is not supported when Mid-call Re-INVITE consumption is configured.
Secure Real-time Protocol - Real-time Protocol (SRTP-RTP) supplementary services and mid-call signaling are configured, so the Re-INVITEs/UPDATEs are not consumed.
Multicast Music On Hold (MMOH) is not supported and the Re-INVITEs/UPDATEs are passed over.
midcall-signalingpassthrumedia-changecommand is configured and high-density transcoder is enabled, there might be some impact on Digital Signal Processing (DSP) resources as the transcoder might be used for all the calls.
Session timer is handled leg by leg whenever this feature is configured.
Information About Cisco UBE Mid-call Re-INVITE/UPDATE Consumption
To configure Cisco UBE Mid-call Re-INVITE you should understand the following concepts:
Passthrough media change method optmizes or consumes mid-call media-related signaling within the call. Mid-call signaling changes will be passed through only when bidirectional media like T.38 or video is added. The command
mid-callsignalingpassthrumedia-changeneeds to be configured to enable passthrough media change.
The Block method blocks all mid-call media-related signaling to the specific SIP trunk. The command
mid-callsignalingblock needs to be configured to enable this behavior. Video escalation and T.38 callflow are rejected when the
mid-callsignalingblock command is configured. This command should be configured only when basic call is the focus and mid-call can be consumed.
Behavior of Mid-call Re-INVITE/UPDATE Consumption
The purpose of Mid-call Re-INVITE Consumption is to ensure smooth interoperatibility of supplementary services like audio Hold/Resume and call transfer. This feature should be used as a last resort only when there is no other option in Cisco UBE. This is because configuring this feature can break video-related features. For Delay-offer Re-INVITE, the configured codec will be passed as an offer in 200 message to change the codec, the transcoder is added in the answer.
How to Configure Cisco UBE Mid-call Re-INVITE Consumption
Example Configuring Passthrough SIP Messages at the Global Level
The following example shows how to passthrough SIP messages at the global level:
Router(config)# voice service voip
Router(config-voi-serv)# no ip address trusted authenticate
Router(config-voi-serv)# allow-connections sip to sip
Router(config-serv-sip)# midcall-signaling passthru media-change
Example Configuring Passthrough SIP Messages at Dial Peer Level
The following example shows how to passthrough SIP messages at the dial peer Level:
Example: Blocking SIP Messages at the Global Level
The following example shows how to block SIP messages at the global Level
Router(config)#voice service voip
Router(config-voi-serv)#no ip address trusted authenticate
Router(config-voi-serv)#allow-connections sip to sip
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Feature Information for Cisco UBE Mid-call Re-INVITE/UPDATE Consumption
GUID-49C47880-20C3-40B5-A513-C1A80291D0918 lists the release history for this feature.
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GUID-49C47880-20C3-40B5-A513-C1A80291D0918 lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Feature Information for Cisco UBE Mid-call Re-INVITE /UPDATE Consumption
Cisco UBE Mid-call Re-INVITE/UPDATE Consumption
The Cisco UBE Mid-call Re-INVITE consumption helps to avoid inter-operatibility issues by consuming the mid-call Re-INVITEs from Cisco UBE.
The following section provides information about this feature:
The following commands were introduced or modified: