The following steps are involved when configuring the LANCOM VoIP Router:
- An entry is created for each ISDN user so that the terminal equipment can register with the upstream SIP PBX.
- For SIP clients, this registration information is entered in the VoIP telephone or the softphone.
- The connection to the SIP PBX, as a SIP-PBX line with the name 'HQ', has already been described in other application examples and familiarity with it is assumed from here on.
- In addition to this connection, a further connection "Gateway“ needs to be made to the SIP PBX, which helps in making the local ISDN connection known to the upstream SIP PBX.
- The connection between the local ISDN connection and the remote SIP PBX is made using the entries in the call-routing table.
This is how the LANCOM is configured for operation as a remote gateway:
- In the ISDN mapping table, local DDIs (extension numbers) are converted to internal telephone numbers for processing as SIP calls.
| MSN/DDI | ISDN/S0 Bus | Internal number | Comment |
|---|---|---|---|
| # | ISDN1, ISDN2 | # | All DDIs pending at the ISDN interfaces are switched further without being changed. |
- A new entry is created in the list of SIP provider connections with
the following information:
- Name of the connection: 'GW.HQ'
- Mode: Gateway
- SIP domain: SIP domain of the headquarters 'mycompany.HQ'
- SIP ID: Account name for the SIP gateway in the SIP PBX located at the headquarters
- Authentication name and password: Registration data for the SIP gateway
- Additional entries are created in the call-routing table to switch calls between the headquarters and the local ISDN connection:
| Called number | Destination number | Source line | Destination line | Comment |
|---|---|---|---|---|
| # | 83# | ISDN | GW.HQ | Forwards all in-going calls arriving at the LANCOM VoIP Router over ISDN to the headquarters via the gateway. The DDI is preceded by '83' so as to map correctly to the internal numbers. |
| 9 | 555 | ISDN | GW.HQ | Forwards all in-going calls arriving at the LANCOM VoIP Router over ISDN to the headquarters via the gateway. 555' is used as the number for support. |
| 0043# | 0# | GW.HQ | ISDN | Forwards all out-going calls from the headquarters to the Austrian national network to the local ISDN connection (without country code). |
| # | # | Forwards all other calls without change. |