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Cisco Bug: CSCvu30089 - DOC - CUCM docs need to state that expressway C needs to be resolvable for OATH to work

Last Modified

Jul 24, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases


Description (partial)

SIP OAuth lines fail to register if CUCM cannot resolve Exp-C hostname.

This is relate to CSCvu01974 which is filed to update the documentation on the expressway side of things

Expressway C connects to CUCM via AXL and adds itself to the CUCM database (check "Further Problem Description" section of this bug for more information).

CUCM will attempt to do a DNS lookup when that entry is made (or updated). If the DNS lookup fails, CUCM will still add the expressway C to the CUCM database; however, secure devices fail to register over MRA.

This is what a failed DNS lookup shows in the CallManager traces when the expressway C is added to the CUCM database:

***At 11:11:14, there is a change notify, looks like Expressway is updating its details via AXL

05466823.000 |11:11:14.539 |SdlSig   |CcmDbTableChangeNotify                 |wait                           |CcmDbChangeNotify(1,100,223,1)   |CcmDbChangeNotify(1,100,223,1)   |1,100,223,1.9646^*^*                     |[T:N-H:0,N:0,L:0,V:0,Z:0,D:0] 
05466823.001 |11:11:14.540 |AppInfo  |DB: SQL1[select * from expresswaycconfiguration  where pkid = '7f2df7d9-2ffa-151f-4424-231d0b9621d1';]
05466823.002 |11:11:14.544 |AppInfo  |DB: SQL2[select * from expresswaycconfiguration  where pkid = '7f2df7d9-2ffa-151f-4424-231d0b9621d1';]
05466823.003 |11:11:14.545 |AppInfo  |Received a change notify from expressway c table

***SIPHandler sends a DNS query here to resolve the hostname, but neither is a matching SRV record nor there is no hostname getting resolved.

05466823.004 |11:11:14.545 |AppInfo  |//SIP/SIPHandler/ccbId=0/scbId=0/peerAddrLookup: Sending DNS query for resolving hostname or srv record vcsc
05466824.000 |11:11:14.546 |SdlSig   |SIPSPISignal                           |wait                           |SIPDns(1,100,182,1)              |SIPHandler(1,100,183,1)          |1,100,223,1.9646^*^*                     |*TraceFlagOverrode
05466824.001 |11:11:14.546 |AppInfo  |SIPDns - convertQueryType: Converted Query ReqType 33
05466824.002 |11:11:14.546 |AppInfo  |SIPDns - copySpiToSdl: DNS req type 8, query preferred type 0 ,pendingDnsReqCount 1
05466825.000 |11:11:14.547 |SdlSig   |SdlDnsSrvRecordRsp                     |wait                           |SIPDns(1,100,182,1)              |SdlResolverService(1,100,5,1)    |1,100,182,1.91^*^*                       |*TraceFlagOverrode 
05466825.001 |11:11:14.547 |AppInfo  |SIPDns - wait_SdlDnsSrvRecordRsp: Received SdlDnsSrvRecordRsp ReqCode is  -1
05466825.002 |11:11:14.547 |AppInfo  |SIPDns - copyRecordRspToRecordReq: Retry SRV query as an 1 query
05466825.003 |11:11:14.547 |AppInfo  |SIPDns - wait_SdlDnsSrvRecordRsp: (DNS A or AAAA query called as SRV query Fail):hostname=, ReqType=33,serversused=0
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