Is there a docking to make speakerphone more robust?

[kpierce1]

This may be seen as a dumb question and I realize the iPhone has a speaker phone built in.

But, is there some type of docking station for device you can plug your iPhone4 into that makes it a more robust speaker phone?

thanks in advance.

 

[bloomington]

iphone horn?

http://www.amazon.com/gp/product/B0052WLVIQ/ref=pd_lpo_k2_dp_sr_3?pf_rd_p=1278548962&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B0048YB5B2&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0C1PNYW77CACXTBPK184