asterisk users - Feb 2013 - Connecting to multiple databases using res_config_pgsql

Hello,

How do I use multiple postgresql databases using res_config_pgsql?

I tried creating multiple contexts in res_pgsql.conf, but asterisk is
only using the 'general' context.

My res_pgsq.conf is

[general]               ;; Connect to mydb on localhost
dbport=5432
dbname=mydb
dbuser=pgdbuser
requirements=warn

[pgwritedb]             ;; Connect to mydb2 on another host
dbhost=<IP of other db server>
dbport=5432
dbname=mydb2
dbuser=pgdbuser2
dbpass=xxxxx
requirements=warn

In extconfig.conf I configured
sippeers => pgsql,general,sip_peers
sipregs => pgsql,pgwritedb,sip_regs

But asterisk is not using 'pgwritedb' to connect for sipregs, its
trying to update 'sip_regs' on the local database.

Thanks