Hi, I'm trying to implement the changes explained in https://freeswitch.org/confluence/display/FREESWITCH/mod_verto, to activate it. The part I don't understand fully is the dial-string changes, for example in the choice 1: Usage: ${verto_contact ${dialed_user}@${dialed_domain}} My first try was to use the second option: <param name="dial-string" value= "{^^:sip_invite_domain=${dialed_domain}:presence_id=${dialed_user}@ ${dialed_domain}}${sofia_contact(*/${dialed_user}@${dialed_domain})}:${verto_contact ${dialed_user}@${dialed_domain}}"/> What I try was to call a local extension that is logued using verto, but somehow is trying to look for it like if is a sofia user, of course it says that the user is not available. I want to understand this line fully, mostly because of the flow that traverse this dial-string. I'd also try the last option of saying that a specific user is a verto user: <params> <param name="dial-string" value="${verto_contact ${dialed_user}@ ${dialed_domain}}"/> </params> That works wonders, but I want my users to use SIP and Verto when one or other is available. Last thing I try is to use choice 2, to bridge in the dialplan: verto.rtc/ foo@bar.com In that case what I do was to use the local extensions dialplan and put the bridge after the sofia user/XXXX, something like a failover option. In this case works calling from SIP (sofia) to verto, but the other way it says the user is not available. The question then is, how can a have a user that can be called using sofia and verto, depending from where is registered/logued Thank You in advance