Routes Management

So that IPBrick executes the routing of the calls between the several network interfaces, it is necessary the definition of specific routes according to a telephony numbering.

As you can see in Figure 4.89 we have this options:

• Local Routes: Represent all the local interfaces available in IPBrick by default;
• Outbound routes: Represent all the outbound routes, so it will be possible to make calls using SIP/IAX accounts;
• SIP servers list for registering: Allow to receive calls for SIP numbers associated to SIP accounts;

Figure 4.89: VoIP - Routes Management

Local routes

Local routes (Figure 4.90) allow the configuration of an interconnection between LAN, PSTN, PBX or INTERNET.

The possible options by default are:

• PSTN-LAN: It allows the call routing from the telephone network to the VoIP phones of local network. So it's a internal IPBrick route than can redirect the received calls from the PSTN to VoIP phones;
• PBX-LAN: It allows the call routing between the telephones connected to the PBX and the VoIP telephones of local network;
• LAN-PBX: It allows the call routing from the VoIP telephones in local network to the telephones of the PBX;
• LAN-PSTN: It allows the call routing from VoIP phones to telephone network;
• INTERNET-PBX: It allows to accept VoIP calls from the Internet and route them to PBX phones. It's a IPBrick internal route only for call redirection;
• INTERNET-PSTN: It allows to accept VoIP calls from the Internet and route them to the telephone network network. It's a IPBrick internal route only for call redirection;
• PBX-PSTN: This is a default internal route. It allows the call routing from the PBX to telephone network. ^4.21
• PSTN-PBX: This is a default internal route. It allows the call routing from the telephone network to the PBX.

If there are other configured interfaces (acting like trunks), they may be added to the list of routes, and for that it is necessary to click the connection Available Local Routes (Figure 4.90) and then add the necessary routes.

Figure 4.90: VoIP - Local Routes

The Insert in the top menu allows to insert one of the routes mentioned. After insertion, each type of route has a connection that allows its configuration. When acceding to this interface it is possible to choose one of these options:

• Back
• Modify: To change the type of local route;
• Delete: Remove the local route;
• Insert: It allows to add the prefixes that must be added to this route. When you indicate a prefix, all the calls whose initial digits coincide with that digit are routed by that route. Choosing Advanced Options we have this options (Figure 4.92):
  • Prefix: The numeric prefix to use to make calls using that route;
  • Include prefix in address: If Yes the prefix will be part of the destination number, so the prefix will be maintained when the call is routed. If No the prefix will be used only to identify the route. Example: To enable the use of number 6 to route a call to the Portuguese PSTN network, it is necessary to remove this prefix in order that the number stays with the correct format (the format 2XXXXXXXX instead of 62XXXXXXXX).
  • Postrouting prefix: It's a prefix added by the IPBrick when the number is received. Example: For the Portuguese PSTN network we use the format 2XXXXXXXX. If we use has main route a SIP account route it's necessary to use prefix 2, include prefix in address and use a postrouting prefix with 00351 (351 is the portuguese international code);
  • Caller IDs restriction: Will restrict the route only for the listed caller ID's;
  • Fallback routes: It's a backup route to use if the present one fails;
  • Generate local ringing tone: Will generate a local ringing tone. Can be used when it can't ring at the destination phone;
  • Priority: Define the prefix priority level.

Outbound routes

This option turns possible to configure which calls shall be routed to a external server which shall be responsible for routing them to their destiny (Figure 4.91). This routing is made through prefixes that may be inserted clicking the name of the route and then the link Insert above the prefixes table. To change or remove a route you only have to click its name and then the option Modify or Delete, respectively.

To add a new outbound route click Insert. The Basic Options are:

• Type: Type of signalling protocol to use: Can be SIP, SIP with TLS or IAX;
• Name: Outbound server name;
• Server Address: Server IP/name address;
• Authentication: If it is necessary to make authentication in server, you shall have to choose the option User/Password and fulfil the users name and respective password;

Choosing Advanced Options the following parameters will be presented:

• Server Port: Server port to use;
• Video support: If the VoIP server supports video, you can enable that option;
• Caller identifier: Outbound caller ID masking;
• Registration realm: Realm is usually the SIP server FQDN but some SIP servers have different server address and registration realm;
• Outbound proxy: Usually not used but is a server that passes the SIP messages between the SIP client and the SIP proxy server;
• Available to Internet: With this option selected, the route shall be available for VoIP telephones outside the LAN;
• Simetric signalling: It allows to define if signalling is sent and received through the same port (5060);
• Activate ENUM search: It allows IPBrick to search through ENUM.^4.22
• DTMF type: Type of DTMF^4.23 to use. Options: RFC2833 (default), Inband, Info and Auto;
• Call limit: Number of possible simultaneous calls using that route, that can be useful for bandwidth control. With 0 we can disable it;

Figure 4.91: VoIP - Outbound route definition

If the outbound route type is IAX, the only parameters are:

• Name;
• Server Address;
• Server Port;
• Available to Internet;
• Call limit.

The prefixes inserted in this outbound routes shall be available automatically for the SIP telephones and the telephones connected to PBX. If there are additional interfaces and you intend to use a outbound route, it is necessary to add the route INTERFACE->INTERNET (for example PBX1->INTERNET or GSM->INTERNET), include in that route a prefix matching the one of the route for the SIP server and include the prefix (in option Include prefix choose Yes).

For each outbound route it's possible to define witch codecs will be used (option Modify and theirs priority with option Order.

Figure 4.92: VoIP - Prefix definition

SIP servers list for registering

Here is possible to visualize the SIP^4.24 address list which have already been configured (Figure 4.93). When inserting a new one, the page generated asks for the following data:

• Name: Server name;
• SIP server address: SIP server IP or address.

After inserting the data, it is necessary to click the button Insert to confirm the insertion of the address. The next step is to register accounts to the local SIP server. Pressing Insert we have this options:

• Login: SIP account login. Normally is the nomadic SIP number;
• Authentication user: Usually equal to login;
• Password: SIP account password;
• Local: Internal phone that will receive the calls comming from Internet to that nomadic number.

Figure 4.93: VoIP - SIP server for registering

Footnotes

... network.^4.21

It's possible to call from phones connected to PBX and, if IPBrick is connected to PSTN and to a PBX, you can also answer calls. IPBrick will work in a transparent mode, switching all the traffic from PBX to PSTN and vice-versa.

... ENUM.^4.22

Group of protocols that aims to associate the telephonic numbering to a new register in DNS. This way, a telephone number shall correspond to a SIP address.

... DTMF^4.23

Dual-tone multi-frequency

... SIP^4.24

Session Initiation Protocol