Can IP phones be disrupted by high data transfers?

We have IP phones constantly tripping and skipping.  In the same office we have a high data transfers to the internet.  Could that affect IP Telephony service?
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Yes definitely. You can test it by either putting on high load yourself (mostly by uploading files), and make an outgoing call, it will probably be 100% bad. Also, test during downtime when no employees are there, your call is probably 100% good.
Also, employees in the same office calling to each other are 100% good.
If this is the case, you have no other choice than to upgrade your bandwidth (where upload is slightly more important, as ADSL means the download is already higher).
Steven CarnahanNetwork ManagerCommented:
You can QOS the voice traffic for better performance

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Tiras25Author Commented:
As for QOS.  Some people saying only if we were using MPLS lines, we use direct internet access (DIA) lines.
Steven CarnahanNetwork ManagerCommented:
You are correct.  QoS in your situation would only work for outbound traffic until it reaches "the wild" at which point the tags will be stripped. It won't work on inbound traffic at all.  

There really isn't a very good solution then. Some might suggest that you contact your provider and ask them to split your pipe however this will simply push the convergence point to the other side of the carrier resulting in only slightly better, if any, performance at a cost increase. What this effectively does is split your connection so that you have two separate links/lines to the internet. You would put voice on one and data on the other.
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IP Telephony

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