new updated list according to the SRV records and after removing tls port.
1 sip:sip.pstnhub.microsoft.com;transport=tls 0 10
socket=tls:172.31.19.8;ping_from=sip:abcsbc.com
1 sip:sip2.pstnhub.microsoft.com;transport=tls 0 20
socket=tls:172.31.19.8;ping_from=sip:abcsbc.com
1 sip:sip3.pstnhub.microsoft.com;transport=tls 0 30
socket=tls:172.31.19.8;ping_from=sip:abcsbc.com
1 sip:sip4.pstnhub.microsoft.com;transport=tls 0 40
socket=tls:172.31.19.8;ping_from=sip:abcsbc.com