This cable is usually (not with all bundles) included with the Polycom IP501 IP phone. If your data / power cable is lost, broken or not included with your IP501 this is the replacement part.

Note: If you are using the Polycom PoE Cable, the Polycom IP501 Data / Power Cable is not necessary.

Setting up an IP phone-OBi connection will also allow you to dial other OBi users directly and easily give the IP phone incoming and outgoing access to a PSTN line — including regular landline emergency 911 calling — with no other hardware needed.

Follow along, and You will:

• Have incoming calls to your Google Voice number ring on your IP Phone and, concurrently, on any other phone (your cell phone, for example) you forward Google Voice calls to;
• Have any incoming call to your OBiTalk number or to a number on a service attached to an OBi110′s physical “Line” port (a PSTN line, for example) ring on your IP phone and, either concurrently or sequentially on another phone number, such as your cell phone;
• Correctly route outgoing calls on your IP phone: Emergency 911 calls through your PSTN (or a E911 enabled VoIP service through a separate analog telephone adaptor), OBiTalk calls through your OBi, and all “regular” phone calls through Google Voice.

All of this can be done without the need for a computer running constantly in the background. You don’t even need to know the ins and outs of the Asterisk PBX because we won’t be using one — fire up an IP phone and an OBi, and you’re all set.

Read more @ http://voxilla.com/2011/02/15/how-to-obify-your-ip-phone-no-asterisk-involved-2623

Read more: How to Expand a Phone Switch With VoIP | eHow.com http://www.ehow.com/how_7907215_expand-phone-switch-

voip.html#ixzz1E2xGZrhg

Instructions

Purchase an Ethernet phone switch (see Resources). Research the best phone switch for your needs before you purchase.

Connect the Ethernet phone switch to your computer. The Ethernet phone switch has two jacks. One jack connects a LAN to a phone jack. The other jack connects the PC to the phone jack.

Connect the transformer cords into the slots. These slots are labeled to help you connect these cords correctly. The cords connect from the Ethernet switch to the computer. They also connect the Ethernet switch to the VoIP phone. Refer to the owner’s manual of the Ethernet switch you purchased for detailed instructions on how to connect the transformer cords.

Read more: How to Expand a Phone Switch With VoIP | eHow.com http://www.ehow.com/how_7907215_expand-phone-switch-voip.html#ixzz1E2xsLzUR

Typically, faxing can be disrupted or act negatively to silence suppression and  to echo cancelling techniques, so these variables would want to be disabled in many cases, as well to packet loss, which can quickly cause a fax to fail. 

Access your ATA device and click Switch to  Advanced View.

Next choose the Line that is being used for faxing. 

Network Jitter is network induced delays of varying amounts for received packets (RTP). The Linksys ATA is capable of keeping a reserve of RTP samples which is known as the Jitter Buffer. The larger the buffer the more jitter the ATA can absorb, but it also will increase delay. A larger Jitter Buffer setting on the line that is used as a fax line will help absorb larger amounts of jitter and help keep the fax from failing.

Look for Network Settings and Set Network Jitter Level to Very High.

Next Go to the Audio Configuration section.

Make the following Configuration Settings in the Audio Configuration section in your Cisco/Linksys ATA device.  These settings will help resolve issues with difficulty when trying to fax over your VoIP connection.  (See the note below with regard to FAX Disable ECAN.)

• Preferred Codec to G711a
• Set Silence Supp to No (default setting).
• Set Echo Supp Enable to No.*
• Set Echo Canceller to No.*
• Set FAX Passthru Method to NSE.
• Set FAX Passthru Codec to G711u.
• Set Use Pref Codec Only to Yes.
• FAX Disable ECAN to Yes.*

*Note: The Fax Pass-through Mode is triggered by NSE events, which we suggest that you choose as the setting of choice.  If available in your configuration settings, the setting “FAX Disable ECAN” can be set to Yes, which will trigger the echo canceller to be automatically disabled and both call waiting and silence suppression to be automatically disabled for the fax pass-through.  Additionally, out-of-band DTMF Tx is also disabled.

Setting the RTP Packet Size.

You may find that the setting for the RTP Packet Size is 0.03 (which is default setting), in which case a lowering of this setting would be more advantageous for faxing.  Real-Time Protocol (RTP) Packet Size choices are typically 10 or 20 or 30 ms with a typical setting of being 20 ms or 0.020.
RTP Packet Size in seconds provides lower latency, but is less efficient, in that more bandwidth will be used for the connection. In general smaller packet sizes would use more bandwidth, however this would be good for faxing since latency is decreased.

First Go to the SIP tab

Then look for the RTP Packet Size Setting.

Make this setting to the standard setting of 0.20 which will help improve faxing success.

READ MORE