Specifications

9261-7974 Issue 06
ESFIRECODER - Emergency Services Firecoder
Page 54
www.multitone.com
SPR Pin Signal Name D9F Conn SPR Pin Signal Name D9F Conn
1 TXD 2 - DSR 6
2 RTS 8 - DTR 4
3 RXD 3 - DCD 1
4 CTS 7 8 +12-24V
5 GND 5
Pins 6, 4 and 1 should be linked on the D9F connector. If this is not possible, then ',DCDON,DSRON'
must be appended to the Device Name parameter otherwise the Printer Agent will not go online.
6.65 Routing
When routing a message externally, a list is built of all the valid routes in the router table, ordered by
preference. For fixed agents (PWIRE, ASYNC etc), there is an entry per MTA, for dial agents (PSTN
etc) there is an entry per dial up number.
Duplicate routes (with the same bearer type and preference) are removed.
This will give a list something like
1. PW MTA 1 (Pref. 1)
2. ISDN number 1 (Pref. 2)
3. ISDN number 2 (Pref. 2)
4. PSTN number 1 (Pref. 3)
5. PSTN number 2 (Pref. 3)
6. PSTN number 3 (Pref. 3)
Provided the preferences are different, it is possible to use a bearer twice. The phone numbers will be
ordered to use "Available" numbers first. If the message is a reply, the highest preference "route" will
be to send it back via the MTA the message came in on. This is handled automatically.
The initial route list for a message can be viewed by setting the "Message Logging" parameter in the
NUA to "DEBUG"
When the message is being dispatched, this route list is used, starting with the first entry, and working
down. For dial up MTA's, the MTA chosen is the 'first' that meets the following requirements:
1. Connected to node
2. MTA inactive and 'available'
3. MTA inactive and 'unavailable'
4. MTA connected to another node
The MTA 'available'/'unavailable' flags are set based on the last message that MTA sent. If it was sent
OK, the MTA is considered 'Available', if not, 'Unavailable'. It's not really a good term to use to
describe it though.