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In this section:
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In this section:
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The
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The Egress INVITE may
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or may not have the SDP depending on the presence of SDP in the received INVITE and late offer interworking configuration. The
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When the methods REFER, SUBSCRIBE, NOTIFY, OPTIONS, MESSAGE, PUBLISH
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, and
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INFO are configured as not supported,
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they are not added in the Allow header.
The
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supported header containing the following extensions: "100rel", "timer" and "path" extensions.
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which is configurable. As a part of RCS support,
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You can configure the
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to
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pass the “From’ and “To”
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headers transparently from ingress to egress call
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leg. Additionally, for access deployments, you can configure the
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to use Username in the To header instead of the Request-URI, while terminating calls to the IP-PBX.
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, based on the ‘Relay Replaces
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Header’ flag in the SIP service on
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the
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does not exist, the INVITE is rejected with 481 response.
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Even though the
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The
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The proxies may forward the request , eventually arriving at one or more User Agent Servers (UASs) that can potentially accept the invitation. These UASs
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queries the user
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frequently to accept the invitation or not. After some time, those UASs can accept the invitation (meaning the session is
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established) by sending a 2xx response.
If the invitation is not accepted, a 3xx, 4xx, 5xx, or 6xx response is sent, depending on the reason for the rejection. Before sending a final response, the UAS can also send provisional responses (1xx) to advise the UAC of progress in contacting the called user.
Sending an INVITE request within an existing dialog to change addresses or ports, add or delete a media stream, and so forth is known as a re-INVITE.
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Reference: RFC 6141 |
The
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There are no state changes
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in the
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if the downstream entity rejects a reINVITE
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The
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When a reINVITE is received
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with a video stream (SDP has both audio and video components), and if
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the downstream entity rejects the reINVITE , the audio stream remains intact and is still active.
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When
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the
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the updated IP address for the audio stream (SDP has both audio and video components), and if the downstream entity rejects the corresponding reINVITE on the other leg
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, the
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When
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the
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the updated IP address for the audio component (SDP has both audio and video components), and
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replies to the corresponding reINVITE on the other leg
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with 200 (OK)
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with video component
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as port=0
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, the video stream is not created and the
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uses the new IP address
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for audio.
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The
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on receipt of an error response for a reINVITE.
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The
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characteristics same as before the rejected reINVITE transaction.
The
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when the previous reINVITE is pending.
When canceling the reINVITES, the
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The
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RFC 6377 requires that, after the
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However, after the
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The call flow depicts the reliable and non-reliable 18x with the SDP call flow.
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