dial verb notes

The following scenarios must work with verb dial

1. Agent's call is sent to ingress application. Call is transfer to another Agent ✔️

2. Agent's call is sent to ingress application. Call is then transfer to landline number via SP

   The call gets transfer if the From header is setup correctly (using endpoint/from_domain: ...) but call setup is not 
   completed due to NAT issues

3. Call is received by ingress application and then transfer to softphone

   The transfer is made but with signaling and media issues)

4. Call is received by ingress application and then transfer to a anotherlandline number via SP

Relevant configuration that works at least for scenario (1) on a local test enviroment

Router => registrarIntf: External; recordRoute: false
Asterisk => outbound_proxy: sip:192.168.1.37:5060;lr (public ip)
            comment local net so Asterisk is expose to the public net
	    external media and signaling are set
	    dial string as follows: PSJIP/routr/sip:1002@sip.local