Configure multiple SIP providers

When I have more than one SIP provider configured on the SIP screen, how do I select the one I want to use? It seems to always default to the first one listed

To not use a particular SIP provider, select Voicent Gateway > Setup > Options > SIP tab, choose the VOIP provider, click Edit, then set the “Use this account for” to zero line.

Also, The SIP provider requires the following codecs: G729/G711/G723, of which you do not support any of them. What do you suggest?

Please use G711. This codec is selected by default.

G729 is a codec with more compression. Though it saves you bandwidth, it does sacrifice audio quality. The low audio quality is OK for phone conversation, but is not good for detecting human vs. answering machine, and thus not suitable for auto dialing or predictive dialing.