# Voice Network Details

DC Tech operates as a Active/Active Geo Redundant Infrastructure to best meet the needs of our partners and your customers.

Below are the addresses and related IPs for different segments of the network.

We recommend that you always use auto provisioning, and if manually configuring a device, use its SRV feature, to benefit from the best available redundancy methods.

We also suggest that you avoid using a specific DNS A Record or direct IP if manually configuring a device.

#### SIP Servers

IMPORTANT: If using this list to white list IPs on your local router or firewall, please ensure you whitelist all IP's or you may experience a service interruption during a maintenance or failover event.

<table border="1" class="align-center" id="bkmrk-%C2%A0-address-dns-a-reco" style="border-collapse: collapse; width: 100%; height: 349.083px; border: 1px solid rgb(206, 212, 217);"><colgroup><col style="width: 25.0199%;"></col><col style="width: 25.0199%;"></col><col style="width: 25.0199%;"></col><col style="width: 25.0199%;"></col></colgroup><tbody><tr style="height: 29.4583px;"><td style="border-color: rgb(206, 212, 217); height: 29.4583px;"> </td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">**<span style="background-color: rgb(191, 237, 210);">Address</span>**</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">**<span style="background-color: rgb(191, 237, 210);">DNS A record resolution IP</span>**</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">**<span style="background-color: rgb(191, 237, 210);">SRV record resolution IP</span>**</td></tr><tr style="height: 29.4583px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 29.4583px;">**<span style="background-color: rgb(241, 196, 15);">SBC Global</span>**

</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td></tr><tr style="height: 63.0417px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 63.0417px;">SIP Trunking

T38 IP-Fax

Legacy Hosted PBX

</td><td style="border-color: rgb(206, 212, 217); height: 63.0417px;">sbc.simplelogin.net</td><td style="border-color: rgb(206, 212, 217); height: 63.0417px;">192.92.8.30 Primary

64.52.82.30 Secondary

</td><td style="border-color: rgb(206, 212, 217); height: 63.0417px;">192.92.8.30

64.52.82.30

</td></tr><tr style="height: 29.4583px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 29.4583px;">**<span style="background-color: rgb(241, 196, 15);">PBX East</span>**</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td></tr><tr style="height: 46.25px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 46.25px;">Hosted PBX

Hosted Call Center

</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">pbx1.mia.simplelogin.net

pbx2-mia.simplelogin.net

</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">192.92.8.71</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">All PBX IPs in varying order  
based on network needs</td></tr><tr style="height: 29.4583px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 29.4583px;">**<span style="background-color: rgb(241, 196, 15);">PBX Central</span>**</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td></tr><tr style="height: 46.25px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 46.25px;">Hosted PBX

Hosted Call Center

</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">pbx2.dfw.simplelogin.net</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">64.52.82.25</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">All PBX IPs in varying order  
based on network needs</td></tr><tr style="height: 29.4583px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 29.4583px;">**<span style="background-color: rgb(241, 196, 15);">PBX West</span>**</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td><td style="border-color: rgb(206, 212, 217); height: 29.4583px;">  
</td></tr><tr style="height: 46.25px;"><td class="align-left" style="border-color: rgb(206, 212, 217); height: 46.25px;">Hosted PBX

Hosted Call Center

</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">pb1.sjc.simplelogin.net</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">64.52.83.20</td><td style="border-color: rgb(206, 212, 217); height: 46.25px;">All PBX IPs in varying order  
based on network needs</td></tr></tbody></table>

##### <span class="sty__il6tzg__cls">**Codecs**</span>

DC Tech operates transparent proxies and does not perform transcoding. This ensure your media does not suffer any quality degradation from the transcoding process. Offered codecs will be negotiated by the SIP Server and a matching preferred codec will be used.

##### **Supported Audio Codecs:**

G.711U (PCMU)\*

G.711A (PCMA)

G.722

G.729\*

**\*Note**: These codecs should always be enabled to guarantee call completion.

##### **Supported Video Codes:**

H.263

H.264

##### <span class="sty__pw4odr__cls">**DTMF**</span>

RFC2833 should always be the preferred DTMF method.

##### <span class="sty__cdnoga__cls">**IP Fax**</span>

DC Tech supports IP Faxing via T.38 and G.711 fallback.

T.38 faxing is supported on most DIDs and Termination carriers and initiated via a T.38 re-INVITE.