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ADSL Modem CISCO867-K9 not connecting with default mtu

Dear Experts ,

The ADSL Modem CISCO867-K9 is not connecting to our NAS router with default mtu value in the NAS router virtual template

Is there is any reason for ths ?  With the below settings my ADSL 867 connecting , but if i remove the (mtu 1440 and ip tcp adjust-mss 1392 , this modem is not connecting

My Virtual Template config

interface Virtual-Template1

mtu 1440

ip unnumbered Loopback3

ip tcp adjust-mss 1392

no logging event link-status

peer default ip address pool test

ppp authentication pap

ppp ipcp address required

ppp multilink

Cisco CISCO867-K9 Dialer interface config

interface Dialer1

ip address negotiated

ip mtu 1440

ip nat outside

ip virtual-reassembly

encapsulation ppp

ip tcp adjust-mss 1392

dialer pool 1

dialer remote-name redback

dialer-group 1

ppp authentication pap chap callin

ppp chap hostname testmtu

ppp chap password 0 test32

ppp chap refuse

ppp pap sent-username testmtu password 0 test32

ppp ipcp dns request

ppp ipcp wins request

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Duplicate post #2