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Cisco CME SIP phone transfer restrict

Cisco CME SIP phone transfer restrict

(OP)
Using 2851 router with CME:
 System image file is "flash:c2800nm-advipservicesk9-mz.124-15.T9.bin"
 Version 4.1(0)
Cisco Unified Communications Manager Express
E1 ISDN  to TELCO

I have few Cisco 7912  skinny and few non Cisco SIP phones.  One of  the 7912 is configured with multiple lines on it and it used like receptionist phone for incoming calls.  Some SIP phones don t have access to E1 , other have . For those  SIP phones with access to E1 I want  to restrict ability for transfer to E1 trunk, they should have only local/..../ transfer.  Only 7912 receptionist   phone should have ability  to transfer to E1.
So in final configuration any SIP or 7912 without access to E1 trunk should make call to receptionist  and he ll transfer to E1.

I put under telephony-service
Transfer-pattern .T
For 7912 phones with access to E1  I make template with command:
transfer max-length 4
This is working fine, but I can not find similar command for non Cisco SIP phones.

/SIP phones config/

voice register global
 mode cme
 source-address 10.1.1.1 port 5060
 max-dn 10
 max-pool 10
 authenticate register
!         
voice register dn  1
 number 6471
 name 6471
 no-reg   
!         
voice register dn  2
 number 6473
 name 6473
 no-reg   
!         
voice register dn  3
 number 6376
 name 6376
 no-reg   
!         
voice register pool  1
 id mac 0009.4553.99DC
 number 1 dn 1
 cor incoming CSS2 default
 codec g711ulaw
!         
voice register pool  2
 id mac 0009.4553.9A26
 number 1 dn 2
 cor incoming CSS2 default
 codec g711ulaw
!         
voice register pool  3
 id mac 0009.4553.9A82
 number 1 dn 3
 cor incoming CSS2 default
 codec g711ulaw


/voip/

voice service voip
 allow-connections h323 to h323
 allow-connections h323 to sip
 allow-connections sip to h323
 allow-connections sip to sip
 supplementary-service h450.12
 no supplementary-service sip refer
 h323     
 sip      
  subscription maximum accept 5
  registrar server expires max 600 min 60

telephony-service
 max-ephones 30
 max-dn 110
 ip source-address 10.1.1.1 port 2000
 max-conferences 16 gain -6
 transfer-system full-consult
 transfer-pattern .T
 fac standard
!
!
ephone-template  2
 transfer max-length 4


/Cisco 7912 config/

ephone-dn  8  dual-line
 number 6477
 name 6477
 corlist incoming CSS2

ephone  5
 device-security-mode none
 mac-address 0019.55EC.A818
 ephone-template 2
 mtp      
 type 7912
 button  1:8
 

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