Retransmission timeout error - SIP NAT issue

when you have this problem in the /var/log/asterisk/full as below .....

[May 15 15:29:09] WARNING[2376] chan_sip.c: Retransmission timeout reached on transmission ZTlmMDZlNjk1ODVkNWU5ZGRlNmI2ZWFhZGM5MDU5NGY. for seqno 2 (Critical Response) -- See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 6401ms with no response
[May 15 15:29:09] WARNING[2376] chan_sip.c: Hanging up call ZTlmMDZlNjk1ODVkNWU5ZGRlNmI2ZWFhZGM5MDU5NGY. - no reply to our critical packet (see https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions).
[May 15 15:29:09] VERBOSE[2420][C-00000000] res_agi.c:     -- AGI Script a2billing.php completed, returning 4
[May 15 15:29:09] VERBOSE[2420][C-00000000] pbx.c:   == Spawn extension (PSTNOutBound, 60383215500, 9) exited non-zero on 'SIP/5106-00000000'

It was due to /var/www/html/admin/modules/core/etc/sip.conf
externip= (MUST SET TO THE CORRECT EXTERNAL IP Address)

How to plan order for new domain on ip serverone

Login to https://portal.ipserverone.com/customer/account/login_owner
login - checkerbox88@gmail.com
password - XXXXXXX
Buy a new domain and picking back on the existing host - RM38
Paid thru maybank2u and now waiting for their sales to revert on the domain registration

How to setup eFax and problems encountered

Refer to the google internet information to setup efax
Problem and remain unresolved - license issue, codec incompatibility especially on unifi pstn line
It seems it's working ok on the P1 trunk.

Nevertheless, in order to support multitenant in elastix, we will have to make changes on the
faxviewer, fax queue and send fax.

faxviewer files modified

/var/www/html/modules/faxviewer/libs/paloSantoFaxVisor.class.php