Using Akismet on contact form

I'm trying to combat some major spam on a client's contact form, and have convinced them to use the Akismet service.

<perch:label for="name">Name <span class="req">*</span></perch:label>
<perch:input id="name" type="text" required="true" label="Name" antispam="name" placeholder="Your name" />

<perch:label for="email_add">Email <span class="req">*</span></perch:label>
<perch:input id="email_add" type="email" required="true" label="Email address" antispam="email" placeholder="ex: email@example.com" />

<perch:label for="phone_num">Phone</perch:label>
<perch:input id="phone_num" type="text" label="Phone #" placeholder="ex: 250-555-5555" />

<perch:label for="address">Address</perch:label>
<perch:input id="address" type="text" label="Address" placeholder="ex: 1234 Main St." />

<perch:label for="city">City</perch:label>
<perch:input id="city" type="text" label="City" placeholder="ex: Nanaimo, BC" />

<perch:label for="message">Message <span class="req">*</span></perch:label>
<perch:input type="textarea" id="message" required="true" antispam="body" label="Details" placeholder="How can we help?" />

The name, email, and message fields all have a corresponding antispam="xyz" parameter – name, email, and body respectively. What about the phone number, address (street), and city fields? Should these have any antispam markup on them?

The phone number field and city field are typically filled in (by spam bots) with "proper" data – i.e., 9-10 numerals for the phone, and a real city name. The address field, however, often gets a scummy URL (again we're asking users for a street address, not a URL).

I'm worried if I use antispam="url" on this field it will not work as intended. Any thoughts here?

Note that the form has just been updated, so it's possible all will work fine without any more code. Just wondering if anyone else has had a similar experience.

Thanks as always!