I have Grandstream HT 503 , and i try to use as a gateway for asterisk .
I could to receive a call from PSTN–> HT 503 --> Asterisk , but i couldn’t to send a call Asterisk -->HT 503 -->PSTN .
I tried many times but
And this is debug of sip operations in asterisk : fpaste.org/OcJo/
And this is sip.conf , where i define fxo port of HT 503 : fpaste.org/rQBP/
And this is Grandstream HT 503 configurations : postimage.org/gallery/v4rupws/1f427891/
And this is Grandstream HT 503 logs when i send a call from asterisk : fpaste.org/Rk2s/
I think you should first upgrade the HT-503 to the firmware official versio, then I see that you have HT-503 not registered SIP but on configurations of the asterix this as type=friend
should be “type=peer” on the asterix and clear the pass y user ID.
Review this manual “GXW410x with Ssterix”, the only difference is that is port 5062, which is the FXO port on the HT503
then this, if not work please open a tickets of trouble on tickets system from Grandstream website, here your engineers will help to fix this trouble gladly
please view below the link