How to Set up Incoming Calls When Connected to a SIP Provider
Due to improper connection of the equipment to the SIP provider's server, connection problems can occur, resulting in the system error. For example, when you try to connect, the system often gives the answer: “500 internal server error”. This error is usually corrected through proper specification of the provider’s SIP-address.
Connecting a SIP requires care and technical knowledge of the process. In order to properly set up and fix the above error, the addresses of SIP-accounts the destination IP-addresses and numbers provided by your ISP should be specified. After descript instructions, sessions and data on the connected devices are provided, you should allocate codes indicating contacts, Call-ID, and data Asterisk PBX, including server and addresses therein.
Next, you should indicate the registrar or a SIP server, registered in the session-target. When switching the SIP-registration, you should request for authentication, using the codec preference 1 g711alaw with digits 2-4. The allow connections sip to sip should also be connected, with and address in trusted list in the voice service VoIP to be specified, without specifying the debug voice translation, debug ccsip messages and other configurations. UC500 should specify the voice service group CCA_SIP_SOURCE_GROUP_EXTERNAL with ACL that contains the address of the SIP-provider. When the last digits issued by the provider to the extensions match, you should set up a Calling Party Transform Mask.
Unwanted calls can be the second mistake when SIP is connected and set up improperly. In order to filter the call, the dial-peer should be specified, with the technical prefix to be added. Afterwards, access-list 5 with data on carrier-id, dial-peer, and permission term should be specified several times.
Many users are faced with the question of connecting to multiple providers, or one SIP because several different SIP-trunks to make calls via the rout pattern should be installed in the first case.
To make calls to the network, SIP-providers provide the Calling Number. In the Route Pattern settings the subscriber numbers should be modified, with all connections to be specified. The call should be checked by calling to the SIP terminal registered in the provider’s network.
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