Enabling Lync media to bypass a VPN tunnel, Understanding Media Flows in Microsoft Teams - BRK4016, Skype for Business on-premises deployment is described in, Phone System Direct Routing (for PSTN connectivity) is described in. Teams User A resolves URL domain name (DNS) using flow 2. There are four general principles that help you understand call flows for Microsoft Teams: A Microsoft Teams conference is hosted by Microsoft 365 or Office 365 in the same region where the first participant joined. The proxy server searches the address of Bob in the location server. Internet. (Note that a third-party SBC on the boundary with PSTN must terminate RTP/RTCP stream, secured using SRTP, and not relay it to the next hop.). Microsoft 365 or Office 365 sends notification to Teams User B using flow 4. Signaling between the customer network and Microsoft 365 or Office 365 is using flow 4. Express Route (optional). Signaling between the VPN user to the customer network is using flow 2' and using flow 4 to Microsoft 365 or Office 365. It is also used by some traffic from the customer network to Microsoft 365 or Office 365. format - png,svg,eps,pdf (optional), As a result, plantuml diagram will be generated. Connectivity to Microsoft 365 or Office 365 is also applicable to these networks. Call Handling Errors. Third-party SIP proxy servers. An INVITE request that is sent to a proxy server is responsible for initiating a session. Call A.1: Call to a non-ported number: From an Originating Exchange a call is set up to MSISDN. Learn more. Interoperability with a third-party SIP proxy is not supported. Media is relayed through Teams Transport Relay to the customer network through flow 4. The clients will send these candidates to the conferencing server in an invite. Provides background information such as networks that the flows may traverse, types of traffic, connectivity guidance from the customer network to Microsoft 365 or Office 365 service endpoints, interoperability with third-party components, and principles that are used by Teams to select media flows. We can divide the message flow based on the services. Signaling and media from the federated Skype for Business client to on-premises Skype for Business Server is out of scope of this document. A Teams media endpoint in Microsoft 365 or Office 365 is used based on media processing needs and not based on call type. Real-time media. Interoperability with a third-party media relay is not supported. Packet shapers. Roaming Service: Send Authentication Info or SAI : This is the first message which is triggered by roaming VLR/SGSN towards the HLR in … The document describes these flows, their purpose, and their origin and termination on the network. If you didn't define all parties in 'participants' dict in conf/conf_uml.py file, then program will dump list of undefined participants for you. The following image shows the basic call flow of a SIP session. H.323 Call Flow The call flow diagram presents the flow of an H.323 call. Teams external user sends "answer" with ICE candidates using flow 3, which is forwarded back to Teams user A using Flow 1. The call is routed to the subscription network being the number range holder network, if the number is non-ported.When GMSCa receives the ISUP IAM, , it requests routing information by submitting a MAP SRI to the MNP_SRF/MATF. The document describes these flows, their purpose, and their origin and termination on the network. How does a proxy help to connect one user with another? 14 Forwarding Violation. The following image shows the basic call flow of a SIP session. Python 3 is not supported, pyshark library https://github.com/KimiNewt/pyshark, run: You can edit 'proto_formatter' dict in conf/conf_uml.py and define there any field from protocol that you want. It originates from the customer network, and it terminates as an endpoint in Microsoft 365 or Office 365. Data encapsulated within Real-time Transport Protocol (RTP) that supports audio, video, and screen sharing workloads. Signaling and media from the federated Skype for Business client to an on-premises Skype for Business Server is out of scope of this document. Remote user with Direct Routing (media bypass relayed by Teams Transport Relay), Figure 21 - Remote user with Direct Routing (media bypass relayed by Teams Transport Relay). Figure 7 - VPN user to external user (direct media). You signed in with another tab or window. 39 No Roaming Number Available. However, media is routed directly peer-to-peer within the customer network using flow 5. It is distributed worldwide with edges in proximity to the customer network in most locations. This program can parse inpur pcap and generate result in plantuml format. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. 49 ATI Not Allowed. Functions include Transport Relay, conferencing server, and Media Processor. The communication link between the client and server, or other clients that are used to control activities (for example, when a call is initiated), and deliver instant messages. However, interoperability with a third-party SBC within the Teams network (where a third-party SBC mediates two Teams or Skype for Business endpoints) is not supported. Given below is a step-by-step explanation of the above call flow −. The SBC must have a public IP address that is routable from Microsoft 365 or Office 365. For each use case, it describes the sequence and selection of flows using a flow diagram. A Teams media flow to and from the PSTN is terminated by a third-party SBC. It should be escaped and do not contains whitespaces, e.g. Finally, Bob sends a 200 OK response to confirm the BYE and the session is terminated. The inbound proxy server contacts the location server to get information about the callee’s address where the user registered. It is not recommended for media traffic (or flow 2'). Hybrid customer network with external Skype for Business user – relayed by on-premises Edge, Figure 16 - Hybrid customer network with external Skype for Business user - relayed by on-premises Edge. The conferencing server does not use a relay since it has a publicly reachable IP address, so it responds with its local IP address candidate. To learn more about the details on the media path that is chosen, see Understanding Media Flows in Microsoft Teams - BRK4016. In general, media traffic is highly latency sensitive, so you would want this traffic to take the most direct path possible, and to use UDP versus TCP as the transport layer protocol, which is the best transport for interactive real time media from a quality perspective. You can copy that list and paste it into configuration file and then fill it values with appropriate names. Signaling between the VPN to the customer network is using flow 2'. Signaling from the client on the Internet to Microsoft 365 or Office 365 uses flow 3. Teams User B sends "answer" with ICE candidates using flow 4, which is forwarded back to Teams User A using Flow 4. This topology includes Teams with Phone System Direct Routing. they're used to log you in. After getting the next route, caller’s proxy server (Proxy 1, also known as outbound proxy server) forwards the INVITE request to the callee’s proxy server which acts as an inbound proxy server (Proxy 2) for the callee. sip.Call-ID=="0feX8451416300Q3beGhEfIgAke@SIP"\|\|sip.Call-ID=="0050569E78EF-554c-acc81700-becf6-588f3c46-495a". Teams User B allocates a media Relay port on Teams Transport Relay using flow 4. In addition, it describes unique Teams flows that are used for peer-to-peer media communication. This is the network segment that supports Microsoft 365 or Office 365 services. Teams is deployed side by side with Skype for Business Online, hence clients are displayed as "Teams/SFB user.". Call flows in various topologies. Media relayed by Skype for Business Media Relay in federated tenant, Figure 11 - Media relayed by Skype for Business Media Relay in federated tenant. If one client is internal on the customer network and one client is external (for example, a mobile cloud user), then it is unlikely that direct connectivity between the local or reflexive candidates is working. After getting the address, it forwards the INVITE request further. In the case that Express Route is justified and deployed, then Teams flows could be re-routed from flow 4 to flow 1 and from flow 4' to flow 1'. Describes how these flows are used when Express Route is deployed for optimization, illustrated using a simple topology. This is the network segment that you control and manage. 15 CUG Reject. Direct Routing (media through Microsoft 365 or Office 365) – PSTN hairpin call across two tenants, Figure 24 - Direct Routing (media through Microsoft 365 or Office 365) – PSTN hairpin call across two tenants. : Any Time Information Handling Errors. Thereafter, 180 Ringing (Provisional responses) generated by Bob is returned back to Alice. The proxy server sendsa 100 Trying response immediately to the caller (Alice) to stop the re-transmissions of the INVITE request. Learn more. The media may flow directly from Teams and/or the Skype for Business client to the SBC (bypassing the Teams gateway) or traverse through the Teams gateway. (Note that traffic from Teams user to the remote Media Relay in the federated customer network will be initially blocked by the Media Relay until traffic in the reverse direction starts to flow. Signaling from the SBC to Microsoft 365 or Office 365 and vice versa uses flow 4 and/or flow 4'. Teams endpoint URLs and IP address ranges are listed in Office 365 URLs and IP address ranges. It's important to understand that this traffic is much less sensitive to latency but may cause service outages or call timeouts if latency between the endpoints exceeds several seconds.