Packet does not reach to destination after call Answer

Asterisk Asterisk SIP
1

WARNING[1511]: chan_sip.c:4072 retrans_pkt: Retransmission timeout reached on transmission MzJlZGUzMWQ3OWQ3YzBjM2JhNmEzMDRkNmVkZTM3MGY. for seqno 2 (Critical Response) – See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 6400ms with no response

2

Have you read the link contained in the message.

This is generally the result of misconfiguring NAT or firewalls, including not telling Asterisk how to find its own public address.