Dears ,
we are having branches connected to our HO through Data connetion terminated on our (Firewall, WAN interface ) , all branches having Phones and faxes registerd to our CUCM version 7.1 through the data connection , few days back a problem occured , all faxes in the branches are not able to send and revieve faxes , only head office faxes are working , (phones in the branches can send and recieve calls wihtout any issue )
our setup is :
branches are connected to our HO ASA like the below
Laye 3 Switch > ISP Router (for data Connection) > HO ISP router conected to HO WAN Switch (layer2 switch ) >connected to HO ASA > on WAN interface
WAN Interface IP 1.1.2.1 /24
we have done the following troubleshooting steps :
NOTE : all of our faxes having the same firmware version and they are same the same model ATA 186
1 - we have checked that all branch faxes and phones are still registerd with our CUCM == registerd without any problem
2- call the fax number from mobile and calling my mobile from the fax machine in branch ==working fine
3- try to send fax from branch to HO over internal extension == fail to send /communcation error
4- tried to send fax between two fax machines on the same branch by using internal Extension only === send succefully
5- connect analog phone to the ATA port and doing incoming and outgoing calls normally without any issue .
5- back to back test with the FW >>connect ATA 186 on the WAN switch and assign the ATA a static IP from the same range of the FW as the below :
FW WAN Interface IP : 1.1.2.1
ATA 186 IP : 1.1.2.2 >Gateway >1.1.2.1
option 150 192.168.1.1 our CUCM
fax was registerd succfully with CUCM but was not able to send\recieve fax which confirm that the problem from our firewall , please advise what i need to check exactly on our firewall ?
