asterisk users - Sep 2017 - Registering Asterisk 13 server PJSIP to Asterisk 11 SIP

Hey all
  
 I am trying to register a PJSIP server on our office to an Asterisk 11 
chan_sip server in a datacenter. 
  
 I keep getting 
  WARNING[18084]: res_pjsip_outbound_authenticator_digest.c:178 
digest_create_request_with_auth_from_old: Host: 'XXX.XXX.XXX.XXX:5060': 
Unable to create request with auth. No auth credentials for realm(s) 
'asterisk' in challenge.
  
 Any insights would be appreciated I have been banging my head for several 
days now. 

Thanks

bryant

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