Can the client (customer) technical representative be Scrum Master?
Is it possible and "Scrum-Compliant" to have a customer's tech figure as  Scrum Master, leading standup daily meeting with Dev. Team? 
  
 I think answer is "no" but I met such a configuration and I became doubtful...
> Is it possible and "Scrum-Compliant" to have a customer's tech figure as Scrum Master... 
  
 There's nothing to stop a client from resourcing a team with its own people, either in whole or in part. What matters is that the duties associated with each Scrum role are not compromised by a conflict of interest. 
  
 > ...leading standup daily meeting with Dev. Team?  
  
 The Scrum Master should coach a team on Scrum practices and facilitate them if required. If a Scrum Master "leads" a daily standup then it suggests the team is insufficiently self-organizing. 
  
 > I think answer is "no" but I met such a configuration and I became doubtful... 
  
 If you think the answer is no, perhaps you suspect a conflict of interest in that particular configuration? Is the Scrum Master a servant leader to the team in this case, or has this responsibility been impeded by other interests?