The customer calls one number outside, it ring once and then call failed. But calling the other number its OK.when using other extensions at the same site to try this number is the same result (call failed).using a mobile to call the same number its working fine.
The error code is 488 Not acceptable
PBX U1960 and the IP phone eSpace7810
the PBX is using SIP Trunk.
Please check the topology as follows:
We captured the packet using wireshark. After R&D analyzed the packet they found the following.
We configured the following command
config softargu type 265 value 0
show softargu configinfor id 265
Then make a test call.it was able to call that number. I was working fine.
detailed function of config softargu type 265 value 0
Whether to resolve the silenceoff in SDP to fax
value range: 0 is NO and 1 is YES