I want to do call and SMS at the same time from dongle device. I used chan_dongle for inbound and outbound call but also want to use SMS through it also.
Does GSM even allow that? It is not something that one would do on a normal phone, so the protocol is likely only to allow it by accident, rather than as the result of a design requirement.
In any case, you should know that this is discussion forum, not one for asking how to do things.