# Codecs on SIP phones

<table border="1" id="bkmrk-yealink-t31p-grandst" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 8.93836%;"></col><col style="width: 21.0974%;"></col><col style="width: 19.1895%;"></col><col style="width: 14.4219%;"></col><col style="width: 36.3528%;"></col></colgroup><tbody><tr><td>  
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</td><td>**Yealink T31P**</td><td>**Grandstream GRP-2602P**</td><td>**Cisco SPA-303**</td><td>**Linphone**</td></tr><tr><td>Versions</td><td>FW 124.86.0.40  
HW 123.1.1.0.2.0.0</td><td><div class="ant-row ant-form-item bak-form-item " style="display: block;"><div class="ant-col ant-form-item-label"><label class="" for="_0.8891145004928236" title=""><span class="text" style="right: 0px;" title="">Boot </span><span class="ant-form-item-children">1.0.1.32  
</span><span class="text" style="right: 0px;" title="">Core </span><span class="ant-form-item-children">1.0.5.17  
</span><span class="text" style="right: 0px;" title="">Prog </span><span class="ant-form-item-children">1.0.5.5</span></label><label class="" for="_0.6789739635488562" title=""><span class="text" style="right: 0px;" title="">Locale </span><span class="ant-form-item-children">1.0.5.40  
</span><span class="text" style="right: 0px;" title="">Res </span><span class="ant-form-item-children">1.0.5.1</span></label></div></div></td><td>  
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</td></tr><tr><td>in order of priority</td><td>**Opus**

**G722**

**PCMA**

**PCMU**

**legacy:**

**G729AB**

G729

**G726/40 kbps**

G726/32 kbps

G726/24 kbps

G726/16 kbps

**iLBC/15.2 kbps**

iLBC/13.3 kbps

**G723.1/63 kbps**

G723.1/53 kbps

</td><td>**Opus**

**G722**

**PCMA**

**PCMU**

**legacy:**

**G.729A/B**

**G.726-40 kbps**

**G.726-32 kbps**

G.726-24 kbps

G.726-16 kbps

**iLBC**

G.723.1 kbps

</td><td>  
</td><td>**Opus/48 kHz**

**Speex/16 kHz**

**PCMU/8 kHz**

**PCMA/8 kHz**

GSM/8 kHz

**G722/8 kHz**

**iLBC/8 kHz**

**G729/8 kHz**

iSAC/16 kHz

**speex/32kHz**

BV16/8 kHz

**L16/44.1 kHz**

(priority order can not be defined in the UI)

**! not supported:**

G.726 (legacy)

G.723 (legacy)

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