Sip 2.0 404 Not Found

Sip 2.0 404 Not Found – If you’re using Microsoft’s phone system in O365, you’re probably already using the call queue and auto-server features. For those who haven’t used it yet (you’re still using Skype for Business Server on-premises), call queues are the answer to group services like Hunt Groups. The online version of Group IVR is Automated Assistant Response. It also replaces the automatic presence feature in Exchange UM.

If you use an on-premises Skype for Business server and are considering moving to Skype for Business Online (which you should), and want to use the same PSTN numbers as you have on the on-premises server for hunting groups , then this explains how you can do that.

Sip 2.0 404 Not Found

Sip 2.0 404 Not Found

Call queue and car attendant services generally require a “service number” obtained from Microsoft to connect to these services. This is fine if the use is “green field” use and no numbers are published externally. However, service numbers will be difficult to use when transferred to teams or SfBO on an on-site platform as previously published numbers need to be changed.

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In this article, I’m going to explain how you can maintain existing published hunt group numbers and transfer them to SfBO, using Cloud Connector Edition. This article is relevant only;

Sip 2.0 404 Not Found

First, let’s create a call queue in the Skype for Business Admin Portal. Log in to the O365 portal and navigate to TeamsSkype for Business Admin Portal.

Then select the “Legacy Portal” option (the Enterprise Voice related components have not yet been moved to the new Admin Portal). In the Legacy Portal, go to the “Call Routing” section.

Sip 2.0 404 Not Found

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Click “Add New” to create a new call queue. Set a name for the call queue and select a domain. Note the domain you used as it will be needed later. Set the call distribution method as desired and the AD group that contains the users who will attend the queue. Save the configuration when complete.

Once the object is created, enter the user part of the object’s SIP URI. We will use this in the Audio Codes Portal.

Sip 2.0 404 Not Found

So O365 is bitten. Log in now to SBC Audio Codes. In the SBC, on the IP group created for SfBO, configure the domain you chose above, in the “SIP Group Name” field. This is important because this domain name will override the host element of the IVITE request going to SfBO. If the domain specified here does not match the domain selected in the call queue, the call will not connect.

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Next to check that call routing is working. In the SBC, a route must be configured to send the call to the SfBO. If it is a standard direct route or CCA use, there should be a route configured to send all calls to O365. The snapshot below shows a route entry configured to route all calls from a SIP trunk to SfBO. The numbers are already in E.164 format. Otherwise, you will need to normalize it to convert it to E.164.

Sip 2.0 404 Not Found

The last part is to configure a configuration rule to translate the published phone number into the user component of the call queue URI. Show screenshot below Change PSTN number on site to +61893231234 hg_dd72839366d64b58b44775ab76428578

The configuration is now complete. When any outside number calls +61893231234, the call will be queued. A service number is not used for this configuration. Today I’m highlighting SIP response status code 404 when working with CloudPBX and Cloud Connector Edition (CCE) Skype for Business Online. The “404 Not Found” error in the Skype for Business client is disguised as “We could not reach +1XXXXXXXXXX” during an external PSTN call.

Sip 2.0 404 Not Found

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First, don’t worry when you see a lot of 404 .Not Found in UccApiLog. These events are expected to occur when a Skype for Business client attempts to subscribe to Presence or connect to contacts on external domains that do not have federation configured or for objects that do not exist in the domain.

All of the above is expected, but what if everything is configured correctly and you experience “404 Not Found” during an outgoing PSTN call when using CCE?

Sip 2.0 404 Not Found

With a successful external PSTN call to the CCA, there will be a SIP “Request 101” followed by a SIP “Progress Report 101”. A progress report will highlight the connection between Skype for Business Online and CCE, showing the call being routed to “OutboundRouting” with a “Trying next hop” message. From this point, we know the call is on the CCE and there will be any SIP errors between the CCE and your PSTN connection.

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The call flow with “404 Not Found” is completely different. There is the same SIP “101 Request”, but it is immediately followed by the SIP “404 Not Found”. What we are looking for is Skype for Business Online doing a reverse number lookup (RNL) for a dialed number in your domain, of course it cannot be found because we are trying to call the PSTN and the call Finishing. has been The call never tries to route out and is not forwarded to the CCE. That last statement is very important, don’t burn the support bike down the wrong rabbit hole. Most CCE problems will be indicated by SIP “504 Server Timeout”: /2017/05/sfb-cce-504/.

Sip 2.0 404 Not Found

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