1. Check the connection bit-rate programmed into Report-IT. The Tieline Music algorithm is optimised for connections up to 28.8Kbps, but it can also deliver good quality audio at lower bit-rates if the available data bandwidth is low over wireless 3G networks. Perhaps drop the bit-rate to 24Kbps and see if this improves the connection if you have a higher bit-rate programmed.
2. Please check the studio codec’s jitter buffer setting. If you are using a G3 Commander Rack Mount codec you can check this by pressing button 3 “Wiz” below the front panel LCD screen, then navigate through the menu to “Jitter Buffer”. Best Compromise is normally appropriate for most connections. If a fixed jitter buffer is selected and you are losing packets and hearing artifacts, either increase the fixed setting and retest your connection, or select an adaptive auto jitter buffer setting like Best Compromise. 
3. It is also possible to check if you are losing abnormal numbers of audio packets by pressing the “Enter/Dial” button on the codec while you are connected to an iPhone using Report-IT. Check the jitter buffer depth displayed and also the number of “Lost” packets while connected. If you are losing a lot of packets then this would also indicate a jitter buffer issue.
4. You can download operational logs from Report-IT on the iPhone, which will let our engineers discover the reliability of packets sent from the phone, as well as incoming packets from the codec at the studio. To sent Tieline the logs tap the “i” symbol in the bottom-right corner of the front screen of Report-IT, then tap “Support” > “Send Logs to Tieline” and enter the name of your Radio Station or relevant identifier. Then tap “Upload” to send the logs to Tieline support for review. Note: it is not normally necessary to send all logs. We will contact you if more than the most recent log files are required.
5. One final thing to check is the default profile setting within Report-IT. Report-IT Enterprise v.3.0.7 and higher has a default profile setting within it, which can be programmed to change the profile on the codec to which it is connecting. If the default setting is programmed, nothing should change on the studio codec. However, if a custom profile has been programmed into this setting, the studio codec may be programmed with settings which are incompatible with live wireless IP connections. I.e., a fixed buffer setting with a low jitter buffer depth.