use tel:nnnnn instead of sip:nnnnn@domain.com
When you use tel:nnnnn, it will use the SIP registration as the outbound proxy. When you use sip:xxxxxx@domain.com, it will send a direct SIP invite to domain.com
use tel:nnnnn instead of sip:nnnnn@domain.com
When you use tel:nnnnn, it will use the SIP registration as the outbound proxy. When you use sip:xxxxxx@domain.com, it will send a direct SIP invite to domain.com