All, we are having phones drop during calls and the handsets showing "TCP Link Error". I was able to look in the error logs of our ECS and see the following at the time the errors showed on the phones.

Code
SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:22      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 8400
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_com.c] Module:[ipp_ipktc_tcp_pkt_snd] Line:[499]
TCP packet sending fai
    lure.
errno = 43

SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:22      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 9700
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_send_ctrl.c] Module:[ipp_ipktc_send_itrvl_ctrl] Line:[904]
Messagge sen
    ding failure addressed to IPKT.
none
SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:22      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 A600
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_send_ctrl.c] Module:[ipp_ipktc_send_ctrl_proc] Line:[604]
Messagge send
    ing failure addressed to Sending control task.
none
SNO:                        0437  RTP Connection Error                      03/07/2018  11:11:23      
  Detailed Reason      : 0073  IPKT Error                              
  Issued Block         : Call Control Block  
  ME/SLV               : ME    
  Unit Name            :                       Unit Number         :        
  Device Category      :                       Port Definition     :                             
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 FE00
  Additional Information: 
    ADIX-ECS ORG=4-19 PARAM=02700062 ; Port#:  624  Unit : VIPSUB Detail:IPKT Link Error                         
SNO:                        0437  RTP Connection Error                      03/07/2018  11:11:23      
  Detailed Reason      : 0073  IPKT Error                              
  Issued Block         : Call Control Block  
  ME/SLV               : ME    
  Unit Name            :                       Unit Number         :        
  Device Category      :                       Port Definition     :                             
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 FE00
  Additional Information: 
    ADIX-ECS ORG=4-19 PARAM=02700062 ; Port#:  624  Unit : VIPSUB Detail:IPKT Link Error                         
SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:26      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 8400
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_com.c] Module:[ipp_ipktc_tcp_pkt_snd] Line:[499]
TCP packet sending fai
    lure.
errno = 43

SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:26      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 9700
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_send_ctrl.c] Module:[ipp_ipktc_send_itrvl_ctrl] Line:[904]
Messagge sen
    ding failure addressed to IPKT.
none
SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:26      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 A600
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_send_ctrl.c] Module:[ipp_ipktc_send_ctrl_proc] Line:[604]
Messagge send
    ing failure addressed to Sending control task.
none
SNO:                        0437  RTP Connection Error                      03/07/2018  11:11:27      
  Detailed Reason      : 0073  IPKT Error                              
  Issued Block         : Call Control Block  
  ME/SLV               : ME    
  Unit Name            :                       Unit Number         :        
  Device Category      :                       Port Definition     :                             
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 FE00
  Additional Information: 
    ADIX-ECS ORG=4-19 PARAM=02490062 ; Port#:  585  Unit : VIPSUB Detail:IPKT Link Error                         
SNO:                        0437  RTP Connection Error                      03/07/2018  11:11:27      
  Detailed Reason      : 0073  IPKT Error                              
  Issued Block         : Call Control Block  
  ME/SLV               : ME    
  Unit Name            :                       Unit Number         :        
  Device Category      :                       Port Definition     :                             
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 FE00
  Additional Information: 
    ADIX-ECS ORG=4-19 PARAM=02490062 ; Port#:  585  Unit : VIPSUB Detail:IPKT Link Error                         
SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:38      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 8400
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_com.c] Module:[ipp_ipktc_tcp_pkt_snd] Line:[499]
TCP packet sending fai
    lure.
errno = 43

SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:38      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 9700
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_send_ctrl.c] Module:[ipp_ipktc_send_itrvl_ctrl] Line:[904]
Messagge sen
    ding failure addressed to IPKT.
none
SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:11:38      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 A600
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_send_ctrl.c] Module:[ipp_ipktc_send_ctrl_proc] Line:[604]
Messagge send
    ing failure addressed to Sending control task.
none
SNO:                        0437  RTP Connection Error                      03/07/2018  11:11:39      
  Detailed Reason      : 0073  IPKT Error                              
  Issued Block         : Call Control Block  
  ME/SLV               : ME    
  Unit Name            :                       Unit Number         :        
  Device Category      :                       Port Definition     :                             
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 FE00
  Additional Information: 
    ADIX-ECS ORG=4-19 PARAM=02830062 ; Port#:  643  Unit : VIPSUB Detail:IPKT Link Error                         
SNO:                        0437  RTP Connection Error                      03/07/2018  11:11:39      
  Detailed Reason      : 0073  IPKT Error                              
  Issued Block         : Call Control Block  
  ME/SLV               : ME    
  Unit Name            :                       Unit Number         :        
  Device Category      :                       Port Definition     :                             
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 FE00
  Additional Information: 
    ADIX-ECS ORG=4-19 PARAM=02830062 ; Port#:  643  Unit : VIPSUB Detail:IPKT Link Error                         
SNO:                   #    02B4  IPP Implementation Info                   03/07/2018  11:12:11      
  Detailed Reason      :                                               
  Issued Block         : IP Platform Block   
  ME/SLV               : ME    
  Unit Name            : CCSU                  Unit Number         :        
  Device Category      : Task                  Port Definition     :                            
  Logical Port Number  :                       Device Attribution  :                             
  Device Control Code  :                       Device Address      : 000-000-000-01-02
  Device Physical Class:                       Device Logical Class:   
  Details              : 
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 8500
  Additional Information: 
    IP-KTC File:[../../SRC/ipktc/SRC/ipp_ipktc_com.c] Module:[ipp_ipktc_ipkt_msg_rcv] Line:[1261]
Message header recei
    ving failure.
none

Any help would be greatly appreciated.