Trace the logs by ucmaint, and find error as blew:
[ccm.c 68641][dwCCMNo= 12] CCM_CheckVOIPDomainCallCapability
[ccm.c 68655][dwCCMNo= 12] CCM_CheckVOIPDomainCallCapability, caller limited domainid:0
[ccm.c 23963][Release Line= 40797][dwCCMNo= 12] CCM_ReleaseCallByCaller( ucCause =  )
Check the settings by "show subscribe dn A", find that the user is in VOIP domain test;
Issue command "show voip domain" to check the settings of VOIP domain. We found the maxcallnum of VOIP domain 0 was configured as "0".