Voip provided by external provider and all hard phones are provisioned from service providers server.
Mikrotik egde routers CCRXX.
VLAN for voip are created. On all swithes (HP 23xx).
The voip issue we have are: when calls comes in to hard phone and the person picks up the phone - you cannot hear anything, just silence . But after second try it will connect and will be able to speak to caller.
Has anyone any ideas what issues could be and what we could start check.