SIP Signaling
Transport Protocols
Voxtelesys supports the following transport protocols for SIP signaling:
| Protocol | Port |
|---|---|
| UDP | 5060 |
| TCP | 5060 |
| TLS | 5061 |
DNS
The FQDNs provided for SIP signaling support A, SRV, and NAPTR DNS record types.
- A Records point to the primary IP address.
- SRV and NAPTR Records enable automatic discovery of both primary and secondary IPs, as well as the supported transport protocols and their respective ports.
Static IP Devices
For SIP devices authenticating via static IP, Voxtelesys utilizes region-specific SIP proxies to provide high availability and geographic redundancy. Customer firewalls and SIP devices utilizing ACLs should explicitly allow traffic to and from the following IP addresses:
| Region | Primary IPv4 | Secondary IPv4 |
|---|---|---|
| SLC2 | 23.155.17.56 | 23.247.232.57 |
| DFW3 | 23.155.18.56 | 23.247.233.57 |
| PIT1 | 216.52.108.56 | 216.52.108.57 |
Static IP clients may also utilize the FQDN gw.pstn.voxtelesys.net, which supports A, SRV, and NAPTR DNS records for transport protocol discovery and failover.
Registered Devices
For devices supporting SIP REGISTER, Voxtelesys will provide an FQDN when creating the credentials for the device. Customer firewalls and SIP devices utilizing ACLs should explicitly allow traffic to and from the following IP addresses:
| Region | Primary IPv4 | Secondary IPv4 |
|---|---|---|
| SLC2 | 23.155.17.55 | 23.155.17.54 |
| DFW3 | 23.155.18.55 | 23.155.18.54 |
| PIT1 | 216.52.108.55 | 216.52.108.54 |
Each FQDN used for SIP registration supports A, SRV, and NAPTR DNS records for transport protocol discovery and failover.