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Resiliency

3 Topics

Direct Routing failover behaviour and lack of recovery from MS Teams side
Hi, We have Direct Routing working fine towards two separate SBC's (each with own wildcard cert) and had calls routing from MS Teams to both of them randomly for the first test customer tenant. All good. sbc1.domain.nz sbc2.domain.nz We then wanted to understand the failover performance and recovery handling if we were to lose a regional SBC and so we performed the following test. - Perform calls from MS Teams to PSTN and calls routing towards both SBC1 and SBC2 randomly as both SBC's are within customer tenant voice route as defined below. New-CsOnlineVoiceRoute -identity "unrestricted.voiceroute" -NumberPattern ".*" -OnlinePstnGatewayList cust-tenant1.sbc1.domain.nz, cust-tenant1.sbc2.domain.nz -Priority 1 -OnlinePstnUsages "NZ.PU" - We then shutdown the SBC public interface for sbc1.domain.nz and calls were routed from MS Teams to sbc2.domain.nz interface only, as expected - We then shutdown the SBC public interface for sbc2.domain.nz and calls continued to try and route towards sbc2.domain.nz, even though OPTIONS had been failing for a while towards this interface from MS Teams. - We then activated the SBC public interface for sbc1.domain.nz. OPTIONs were sent and ACK from sbc1 to MS Teams OK. However MS Teams never started to send OPTION's to this sbc1. - We waited for 30 mins and there was no change. - We then activated the SBC public interface for sbc2.domain.nz. OPTION's were quickly established in both directions and calls started working from MS Teams towards this sbc2 quite quickly. - It has now been 4 days and I am still unable to get MS Teams to send OPTION's messages to sbc1. The MS teams admin portal shows the "SIP Options Status" for sbc1 as "Warning" "There is a problem with the SIP OPTIONS. The Session Border Controller exists in our database (your administrator created it using the command New-CSOnlinePSTNGateway). But we have difficulties determining SIP Options status. Please check in 15 minutes." I have tried the following to recover this situation. 1. Deleted the sbc1 from msteams admin portal for 24 hours and recreated. No difference. 2. Change the SIP Port used for sbc1. No difference. My observations are as follows :- 1. MS Teams appears to only try and recover SIP OPTIONS for the "last" SBC that was working. 2. Other SBC's that failed prior to last working SBC are not recovered from MS Teams side. 3. Don't perform this kind of controlled failure when everything is working fine .. you will regret it 🙂 If anyone has any advice on how we can get sbc1 working normally again (i.e. get MS Teams to sned OPTIONS towards it) .. your help would be appreciated. Thanks David
Solved
David_NOW_NZ
Apr 05, 2021 Place Microsoft Teams
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