Asterisk IP PBX inter-connection with ZTE Softswitch

We’re currently trying to interconnect the Asterisk PBX with a ZTE Softswitch. The scenario is this, using the account and password provisioned in the ZTE Softswitch, I created a SIP Trunk from the Asterisk Box, then using an extension, we tried making a PSTN call going to the ZTE SIP Trunk, but apparently an error message “503 Service Unavailable” was the result.

It was verified on the ZTE side that the account has registered successfully.

Any help on this.


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